added README.md

.gitignore

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 app/key.properties
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+google-services.json

README.md

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+# Bet (Obstawiamy mundial)
+Bet World Cup games with friends
+
+<a href=".media/1.png"><img src=".media/1.png" width="210"></a>
+<a href=".media/2.png"><img src=".media/2.png" width="210"></a>
+<a href=".media/3.png"><img src=".media/3.png" width="210"></a>
+<a href=".media/4.png"><img src=".media/4.png" width="210"></a>
+
+# Description
+Application written right before 2018 FIFA World Cup with intention for learning Dagger2 and MVVM.
+
+Firebase Firestore is used as read-only database which provides realtime updates and zero impact on real backend. 
+Fetching match updates, betting and push notifications is controlled by [Golang backend](https://github.com/JaCzekanski/bet-server).
+
+Application doesn't require any authentication as it relies on Anonymous Signin feature of Firebase Auth.
+Inviting friends to bets is done using Firebase Invites (now Firebase Dynamic Links) simplifying whole user experience. 
+
+# Technologies
+[Android app](https://github.com/JaCzekanski/bet-app):
+- Kotlin
+- Dagger
+- MVVM
+- RxJava
+- Firebase (Auth, FCM, Invites, Remote Config)
+- Retrofit2
+- OkHttp
+- Moshi
+
+[Backend](https://github.com/JaCzekanski/bet-server): 
+- Golang
+- Firebase Admin
+- Gorilla
+- Gocron
+
+# Build
+```
+./gradlew :app:assembleDebug
+```
+*Note: google-services.json file is required*
+
+# Authors
+- [Jakub Czekański](https://www.github.com/JaCzekanski) - Android and Backend development
+- [Kacper Rachtan](https://www.behance.net/sober) - Idea, UI and UX