update readme

Author: handipriyono

README.md

@@ -30,3 +30,22 @@ consist of:
   - Open `npx react-native run-ios`
 
 9. Enjoy!!!
+
+## List of Q & A:
+
+- Q: I got error `Error: spawn ./gradlew EACCES` when run `npx react-native run-android`
+- A: Run this command `chmod 755 android/gradlew` from your root project directory
+
+- Q: I got error `Error: SDK location not found. Define location with sdk.dir in the local.properties file or with an ANDROID_HOME environment variable.`
+- A:
+
+  - Go to your Project -> Android
+  - Create a file local.properties
+  - Open the file
+  - Paste your Android SDK path depending on the operating system:
+    - Windows:
+      sdk.dir = C:/Users/`USERNAME`/AppData/Local/Android/sdk
+    - Linux or MacOS
+      sdk.dir = /home/`USERNAME`/Android/sdk
+
+  Replace `USERNAME` with your user name