Revert "Will go back"

This reverts commit 8ec79a2e5cd73053b0e1663ed5637ea2ef473052.
Revert "Updated MainActivity.java"

This reverts commit f88395911b41148405ac7aadd7f89927103e41c9.
Revert "Formatted code - amended message"

This reverts commit 8f644e98f4ebb9e3e2a4374aa2f1239c477cb85c.
Revert "Added a button to activity_main.xml"

This reverts commit 3927f66f226975baf7b5c9de8f1705279e02da65.
Change Hello World message