In this assignment your app needs to do the following:  Have a simple UI TextView EditText Button to Read Text Button to Append Text Button to Replace Text Write to a File Write and Append Text Overwrite Existing Text Read contents of a File  Your UI should allow us via the EditText to either add new text on a new line in your file or overwrite the file with the text in EditText. When we click to read text the TextView will be replaced with the current contents of your file. If your app does this you will get full credit for this assignment.