chore: add license, changelog, contributing

Author: adhocore

CHANGELOG.md

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+## How to contribute
+
+### Before you start
+
+<!-- This section contains conventions/standards contributors must follow -->
+<!-- For example: Commit messages should follow angular standard -->
+
+### Setting up
+
+You may need to fork this project in [GitHub](https://github.com/adhocore/php-cli-highlight).
+
+```sh
+git clone git@github.com:adhocore/php-cli-highlight.git
+
+# OR if you have a fork
+git clone git@github.com:<your_github_handle>/php-cli-highlight.git
+
+# You may also add upstream
+git remote add upstream https://github.com/adhocore/php-cli-highlight.git
+
+cd php-cli-highlight
+
+# Create a new branch
+git checkout -b $branch_name
+
+# Install deps
+composer install -o
+```
+
+### Moving forward
+
+```sh
+# Open php-cli-highlight in IDE
+subl php-cli-highlight
+
+# ... and do the needful
+
+# Optionally run the lint
+for P in src tests; do find $P -type f -name '*.php' -exec php -l {} \;; done
+
+# ... and phpcs fixer or stuffs like that!
+
+# Run tests
+vendor/bin/phpunit --coverage-text
+
+
+# If your feature takes long your dev branch might be out of sync, you may want to
+git checkout $branch_name
+git pull upstream master # branch could be something else than master
+```
+
+### Finalizing
+
+Everything looking good?
+
+```sh
+# Commit your stuffs
+git add $file ...$files
+git commit -m "..."
+
+# Push 'em
+git push origin HEAD
+```
+
+Now goto [GitHub](https://github.com/adhocore/php-cli-highlight/compare?expand=1), select your branch and create PR.
+
+### Getting PR merged
+
+You have to wait. You have to address change requests. Be patient.
+
+Thank you for contribution!
+
+**Lastly** Please be informed that your works will be licensed same as the project [license](./LICENSE)

CONTRIBUTING.md

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+MIT License
+
+Copyright (c) 2019 Jitendra Adhikari
+
+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.