Update README

Author: MarkNjunge

README.md

@@ -12,29 +12,50 @@
 
 A sample food delivery application for a coffee shop.
 
-🚧 I'm currently updating it to MVVM and using my own API instead of Firebase. 🚧
-
 ## Features
 
 - 100% Kotlin.
-- MVP architecture.
+- MVVM architecture.
 - Retrofit with Coroutines
 - Room for local data storage.
-- Firebase Authentication for Authentication.
-- Firebase Cloud Firestore for remote database.
-- Firebase Cloud Messaging for notifications.
-- Firebase Crashlytics for crash reporting.
-- Mpesa payment
+- Google Sign In or password Authentication.
+- Firebase messaging for notifications.
+- Sentry for error logging.
+- Koin for dependency injection.
+- M-Pesa payments.
 
-## Cloning
+## Prerequisites
 
-1. Clone the repository
-2. Create a `keys.properties` file based on`keys.properties.sample`.
+### Firebase Project
+
+Used for messaging.
+
+1. Create an project on [Firebase](https://console.firebase.google.com/).
+2. Add an application `com.marknkamau.justjava.debug`.
+
+### GCP project
+
+Used for maps when adding a delivery address.
 
-- Follow the deploy instructions for [JustJava-CloudFunctions](https://github.com/MarkNjunge/JustJava-CloudFunctions)
-  to get an api Key. If you don't want to use M-Pesa, you can leave the `API_KEY` as is.
+1. Go to the [GCP console](https://console.cloud.google.com) and switch to the project created by Firebase (or any other).
+2. Enable _Maps SDK for Android_ and _Places API_ in [API Library](https://console.cloud.google.com/apis/library).
+3. Take note of the API keys (AIza...) in [credentials](https://console.cloud.google.com/apis/credentials) or create one yourself.
 
-3. Create a Firebase project and enable Email/Password sign in. Add three applications `com.marknkamau.justjava`, `com.marknkamau.justjava.debug` and `com.marknkamau.justjavastaff`. Add the `google-service.json` file to `/app` and `/justjavastaff`.
+**NB:** If you use your own API endpoint, you will need to change the `googleClientId` in [`/app/build.gradle`](/app/build.gradle#L24)
+
+### Sentry (optional)
+
+Used for error logging.
+It is only used in `release` builds.
+
+1. Create a project on [Sentry](https://sentry.io/)
+2. Take note of the project's DSN. _[Where can I find my DSN?](https://forum.sentry.io/t/where-can-i-find-my-dsn/4877)_
+
+## Installation
+
+1. Clone the repository
+2. Create a `keys.properties` file based on`keys.properties.sample`.
+3. Add the `play-services.json` file from firebase to `./app`.
 4. Open and build in Android Studio.
 
 ## Screenshots