Update README.md

README.md

@@ -20,7 +20,73 @@ Follow the instructions given [here](https://reactnative.dev/docs/environment-se
 environment depending on the OS running on your machine(Windows, MacOS, Linux), and the mobile device you want to 
 run the app on(Android, iOS).
 
+### Set Java 8 as default JRE
+```
+$ sudo update-alternatives --config java
+[sudo] password for jmiranda: 
+There are 5 choices for the alternative java (providing /usr/bin/java).
+
+  Selection    Path                                            Priority   Status
+------------------------------------------------------------
+  0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      auto mode
+  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
+* 2            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode
+  3            /usr/lib/jvm/java-7-oracle/jre/bin/java          1073      manual mode
+  4            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode
+  5            /usr/lib/jvm/java-9-openjdk-amd64/bin/java       1091      manual mode
+  
+Press <enter> to keep the current choice[*], or type selection number: 4
+update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode
+```
+### Set JAVA_HOME to Java 8
+```
+export JAVA_HOME = /usr/lib/jvm/java-8-openjdk-amd64
+```
+
+### Set Android Home and PATH environment variables
+```
+export ANDROID_HOME=$HOME/Android/Sdk
+export PATH=$PATH:$ANDROID_HOME/emulator
+export PATH=$PATH:$ANDROID_HOME/tools
+export PATH=$PATH:$ANDROID_HOME/tools/bin
+export PATH=$PATH:$ANDROID_HOME/platform-tools
+```
+
+### Check version of Android Debugger
+```
+$ adb --version
+Android Debug Bridge version 1.0.41
+Version 31.0.3-7562133
+Installed as /home/jmiranda/Android/Sdk/platform-tools/adb
+```
+
+### Connect to Android phone over USB
+I think we should see the Android device in the list of emulators, but I don't see mine yet :(
+```
+$ emulator -list-avds
+Nexus_5X_API_28
+TestAVD
+```
+
+### Check that an EnvironmentActual.ts exists and has API_BASE_URL defined
+```
+$ cat app/utils/EnvironmentActual.ts 
+import {Environment} from "./Environment";
+export const EnvironmentActual: Environment = {
+  API_BASE_URL: "https://openboxes.ngrok.io/openboxes/api"
+}
+```
+
+### Start Metro server 
+The Metro server is supposed to start when running the yarn android command, but it was not working for me on 
+Ubuntu 18.04. Therefore I had to start it up myself. See this issue for more details https://github.com/openboxes/openboxes-mobile/issues/10
+```
+$ npx react-native start
+```
+
+
 ## Build and run the app
+
 ### On Android
 ```
 yarn android