Added instructions

Author: Reed

README.md

@@ -1,2 +1,13 @@
 # external_module_templater
+
 Builds out external module template files for quick module generation
+
+Instructions:
+1. Download the repository and extract so the "external_module_templater_vx.x" folder is in the redcap/modules folder of your web server.
+2. In Control Center > External Modules, enable "External Module Templater - vx.x"
+3. Refresh the Control Center and click "Generate External Module Template" link at under "External Modules" header of the sidebar.
+4. Fill out the form and click "Generate External Module Template" button at the bottom of the page.
+5. Your browser should now download a .zip containing at minimum:
+	* a PHP class/module file
+	* a README.md file
+	* a config.json file