Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+# Formatting
+
+Please follow the existing formatting for each entry.  In order to get newlines without paragraph breaks, each entry should have two spaces at the end of the line after both the URL and the title.  Also, two-space indents before the URL and the description.  Example:
+
+```markdown
+- **Link Title**<space><space>  
+<space><space>http://example.com<space><space>  
+<space><space>Link description here
+```
+
+Result:
+
+- **Link Title**  
+  http://example.com  
+  Link description here
+
+Please do _not_ strip whitespace for existing entries!