Add CORS middleware and user database schema

- Implemented CORS middleware in the project to handle cross-origin requests.
- Added necessary files for the CORS package including README, LICENSE, and history documentation.
- Created a SQL schema for the users table with appropriate fields and constraints.
- Inserted mock data into the users table for testing purposes.

node_modules/object-assign/index.js

@@ -0,0 +1,90 @@
+/*
+object-assign
+(c) Sindre Sorhus
+@license MIT
+*/
+
+'use strict';
+/* eslint-disable no-unused-vars */
+var getOwnPropertySymbols = Object.getOwnPropertySymbols;
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+var propIsEnumerable = Object.prototype.propertyIsEnumerable;
+
+function toObject(val) {
+	if (val === null || val === undefined) {
+		throw new TypeError('Object.assign cannot be called with null or undefined');
+	}
+
+	return Object(val);
+}
+
+function shouldUseNative() {
+	try {
+		if (!Object.assign) {
+			return false;
+		}
+
+		// Detect buggy property enumeration order in older V8 versions.
+
+		// https://bugs.chromium.org/p/v8/issues/detail?id=4118
+		var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
+		test1[5] = 'de';
+		if (Object.getOwnPropertyNames(test1)[0] === '5') {
+			return false;
+		}
+
+		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
+		var test2 = {};
+		for (var i = 0; i < 10; i++) {
+			test2['_' + String.fromCharCode(i)] = i;
+		}
+		var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
+			return test2[n];
+		});
+		if (order2.join('') !== '0123456789') {
+			return false;
+		}
+
+		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
+		var test3 = {};
+		'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
+			test3[letter] = letter;
+		});
+		if (Object.keys(Object.assign({}, test3)).join('') !==
+				'abcdefghijklmnopqrst') {
+			return false;
+		}
+
+		return true;
+	} catch (err) {
+		// We don't expect any of the above to throw, but better to be safe.
+		return false;
+	}
+}
+
+module.exports = shouldUseNative() ? Object.assign : function (target, source) {
+	var from;
+	var to = toObject(target);
+	var symbols;
+
+	for (var s = 1; s < arguments.length; s++) {
+		from = Object(arguments[s]);
+
+		for (var key in from) {
+			if (hasOwnProperty.call(from, key)) {
+				to[key] = from[key];
+			}
+		}
+
+		if (getOwnPropertySymbols) {
+			symbols = getOwnPropertySymbols(from);
+			for (var i = 0; i < symbols.length; i++) {
+				if (propIsEnumerable.call(from, symbols[i])) {
+					to[symbols[i]] = from[symbols[i]];
+				}
+			}
+		}
+	}
+
+	return to;
+};

node_modules/object-assign/license

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

node_modules/object-assign/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "object-assign",
+  "version": "4.1.1",
+  "description": "ES2015 `Object.assign()` ponyfill",
+  "license": "MIT",
+  "repository": "sindresorhus/object-assign",
+  "author": {
+    "name": "Sindre Sorhus",
+    "email": "sindresorhus@gmail.com",
+    "url": "sindresorhus.com"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "xo && ava",
+    "bench": "matcha bench.js"
+  },
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "object",
+    "assign",
+    "extend",
+    "properties",
+    "es2015",
+    "ecmascript",
+    "harmony",
+    "ponyfill",
+    "prollyfill",
+    "polyfill",
+    "shim",
+    "browser"
+  ],
+  "devDependencies": {
+    "ava": "^0.16.0",
+    "lodash": "^4.16.4",
+    "matcha": "^0.7.0",
+    "xo": "^0.16.0"
+  }
+}

node_modules/object-assign/readme.md

@@ -0,0 +1,61 @@
+# object-assign [![Build Status](https://travis-ci.org/sindresorhus/object-assign.svg?branch=master)](https://travis-ci.org/sindresorhus/object-assign)
+
+> ES2015 [`Object.assign()`](http://www.2ality.com/2014/01/object-assign.html) [ponyfill](https://ponyfill.com)
+
+
+## Use the built-in
+
+Node.js 4 and up, as well as every evergreen browser (Chrome, Edge, Firefox, Opera, Safari),
+support `Object.assign()` :tada:. If you target only those environments, then by all
+means, use `Object.assign()` instead of this package.
+
+
+## Install
+
+```
+$ npm install --save object-assign
+```
+
+
+## Usage
+
+```js
+const objectAssign = require('object-assign');
+
+objectAssign({foo: 0}, {bar: 1});
+//=> {foo: 0, bar: 1}
+
+// multiple sources
+objectAssign({foo: 0}, {bar: 1}, {baz: 2});
+//=> {foo: 0, bar: 1, baz: 2}
+
+// overwrites equal keys
+objectAssign({foo: 0}, {foo: 1}, {foo: 2});
+//=> {foo: 2}
+
+// ignores null and undefined sources
+objectAssign({foo: 0}, null, {bar: 1}, undefined);
+//=> {foo: 0, bar: 1}
+```
+
+
+## API
+
+### objectAssign(target, [source, ...])
+
+Assigns enumerable own properties of `source` objects to the `target` object and returns the `target` object. Additional `source` objects will overwrite previous ones.
+
+
+## Resources
+
+- [ES2015 spec - Object.assign](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign)
+
+
+## Related
+
+- [deep-assign](https://github.com/sindresorhus/deep-assign) - Recursive `Object.assign()`
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)