Template Improvements

Added a Reading List header template and added some functionality to the
Markdown header making it easier to add headers to existing files

.vim/templates/readinglist

@@ -0,0 +1,9 @@
+:insert
+* *Title*:
+* *Author*:
+* *Started*:
+* *Finished*:
+* [Goodreads Link]()
+
+# Highlights / Notes
+