docs: Add README, LICENSE and CONTRIBUTING md

Author: TheAlexLichter

CONTRIBUTING.md

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+# Contributing to Cipher Collection
+
+1. [Fork](https://help.github.com/articles/fork-a-repo/) this repository to your own GitHub account and then [clone](https://help.github.com/articles/cloning-a-repository/) it to your local device.
+2. Install the dependencies: `npm install`.
+3. Edit a current cipher or add a new cipher file in the `src` folder.
+4. Add tests into `test/` directory and try them with `npm test`.
+5. Make the PR!

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) Alexander Lichter ([@manniL](https://github.com/manniL))
+
+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.

README.md

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+# Cipher Collection - All crypto algorithms you need
+
+> Zero-dependency modular cipher collection including all well-known and often used ciphers.
+
+## Features
+
+- Modules per cipher to reduce size
+- Available as UMD, CJS and ES Module
+- Well tested and [documented](./docs/index.md)
+- Zero dependencies
+- Customizable error handling
+
+## Getting started
+
+
+### Through NPM
+```
+$ npm install cipher-collection
+```
+
+ES6 import:
+
+```
+import { rot } from 'cipher-collection'
+
+console.log(rot('Hello world!'))
+```
+ES5 import:
+
+```
+const rot = require('cipher-collection/rot')
+
+console.log(rot('Hello world!'))
+```
+
+
+## Currently available ciphers
+
+- ROT-N (custom number of rotations, optional number rotation)
+
+
+## Contributing
+
+Please see our [CONTRIBUTING.md](./CONTRIBUTING.md)
+
+
+## 📑 License
+
+[MIT License](./LICENSE) - Copyright (c) Developmint - Alexander Lichter