Compose Activity now gives visual feedback

added a spinning progress bar to indicate status posting
made the button to also change colors from blue to grey so the user doesn't keep clicking it

app/src/main/res/drawable/compose_button_colors.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:state_enabled="true">
+        <shape>
+            <corners
+                android:radius="3dp"/>
+            <solid
+                android:color="@color/md_blue_600"/>
+        </shape>
+    </item>
+
+    <item android:state_enabled="false">
+        <shape>
+            <corners
+                android:radius="3dp"/>
+            <solid
+                android:color="@color/md_blue_grey_300"/>
+        </shape>
+    </item>
+
+</selector>