docs: update BUILD.md

BUILD.md

@@ -10,28 +10,33 @@ git clone [email protected]:synonymdev/bitkit.git && cd bitkit
 
 2. Switch Node version
 
-Switch to the Node.js version defined in `.nvmrc`. If `nvm` (or similiar) is installed on your system you can run `nvm use`.
+Switch to the Node.js version defined in `.nvmrc`. If `nvm` (or similar) is installed on your system you can run `nvm use`.
 
 3. Install dependencies
 
 ```shell
 yarn install
 ```
 
-4. Setup iOS or Android dependencies
+## Build
 
-```shell
-yarn setup-ios
-```
+### iOS
 
-or
+For iOS: Open the `ios` folder in Xcode to build the project.
 
-```shell
-yarn setup-android
-```
+### Android
 
-## Build
+For Android: `yarn bundle`.
 
-For iOS: Open the `ios` folder in Xcode to build the project.
+Moreover, to build the Android APK, it is necessary to configure a signing store to sign
+the apk, as explained by [React Docs](https://reactnative.dev/docs/signed-apk-android).
+
+It is recommend to use the already presented `debug.store` in `android/app`.
+Add the following lines to `~/.gradle/gradle.properties`:
 
-For Android: `yarn bundle`
+```shell
+BITKIT_UPLOAD_STORE_FILE=debug.keystore
+BITKIT_UPLOAD_STORE_PASSWORD=android
+BITKIT_UPLOAD_KEY_ALIAS=androiddebugkey
+BITKIT_UPLOAD_KEY_PASSWORD=android
+```