Added use instructions

Author: ramtob

README.md

@@ -8,3 +8,10 @@ A browser bookmarklet which fills your page text fields with long texts, to chec
 4. Right-click on the bookmark to edit it
 5. Paste the clipboard into the address/location field
 6. In the name/description field insert "Check Text Overflow"
+7. Confirm
+
+# Use
+1 Click on the bookmarklet link/button
+2 A prompt will ask you for the length of the string to insert
+3 Confirm
+4 Look and see!