Add instructions and a proper README

README.md

@@ -1 +1,23 @@
-# reset-android-studio
+# Reset Android Studio
+
+When Android Studio is upgraded, projects often fail to build for mysterious reasons. This script 
+can clear everything at one go, so you can start with a clean slate & minimize wasted time.
+
+## How to use
+
+1. Download and place this script somewhere on your local machine.
+2. From the root of your Android Studio project, run it: `reset-android-studio-mac.sh`
+
+## Frequently Asked Questions
+
+### Is there a Linux or Windows equivalent?
+
+Not yet, since I primarily develop on macOS. Please feel free to contribute alternate versions.
+
+### Is there a way to do a dry run?
+
+For the sake of simplicity, there is currently no option to do a dry run. If you know you need this,
+just go ahead and run it.
+
+I assume you have all your important source code under version control anyway, so if this deletes
+something you wish it did not delete, you should be able to revert it from your source control.