[WIP] Checkpoint

CONTRIBUTING.md

@@ -107,6 +107,19 @@ Refer to
 ["How to Write a Git Commit Message"](https://cbea.ms/git-commit/)
 for general rules on writing a good commit message.
 
+tl;dr
+> 1. Separate subject from body with a blank line
+> 2. Limit the subject line to 50 characters
+>    * [...]shoot for 50 characters, but consider 72 the hard limit.
+> 3. Capitalize the subject line
+> 4. Do not end the subject line with a period
+> 5. Use the imperative mood in the subject line
+>    * A properly formed Git commit subject line should always be able
+>      to complete the following sentence: "If applied, this commit will
+>      _your subject line here_"
+> 6. Wrap the body at 72 characters
+> 7. Use the body to explain what and why vs. how
+
 In addition to those guidelines, please add one of the following
 prefixes to the subject line if appropriate.
 * `fix:` - The primary purpose is to fix an existing bug.