feat: add README.md and LICENSE

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2021 Dawid Wysokiński
+
+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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+# Zdam Egzamin Zawodowy
+
+![Screenshot](/screenshots/homescreen.jpg?raw=true)
+
+A mobile app for practising the theoretical part of the [vocational exam](https://cke.gov.pl/en/vocational-examination/).
+
+## Development
+
+### Prerequisites
+
+1. Node.JS
+2. yarn
+3. [JDK and Android Studio](https://reactnative.dev/docs/environment-setup)
+
+### Installation
+
+1. Clone this repo
+
+```
+git clone git@github.com:zdam-egzamin-zawodowy/mobile-app.git
+```
+
+2. Navigate to the directory where you have cloned this repo.
+3. `yarn install`
+4. `yarn run android` (iOS isn't supported)
+
+### Firebase (Analytics and Crashlytics)
+
+Create a new firebase project and add the app `com.dawidwysokinski.zdamegzaminzawodowy`, then download the `google-services.json` file and place it at the following location: `/android/app/google-services.json`.
+
+## License
+
+Distributed under the MIT License. See `LICENSE` for more information.
+
+## Contact
+
+Dawid Wysokiński - [contact@dwysokinski.me](mailto:contact@dwysokinski.me)