feat(build): fluidattacks#1108 document contributing

Add new sections to the contributing.md file to help newcomers.

- Running your local changes
- Adding yourself to the mailmap
- Validating commit message
- DCO
- Adding and rendering documentation

Update lintMarkdown config.

Signed-off-by: Robin Quintero <rohaquinlop301@gmail.com>

docs/src/contributing.md

@@ -38,6 +38,53 @@ Examples:
 - [feat(build): #252 aws secrets from env](https://github.com/fluidattacks/makes/commit/1c9f06a809bd92d56939d5809ce46058856fdf0a)
 - [feat(build): #232 make parallel utils](https://github.com/fluidattacks/makes/commit/99e9f77482a6cbc9858a7a928a91a8a8aa9ff353)
 
+### Testing your local changes
+
+You can run local changes by simply running `m . <job>`.
+If you're adding new files, make sure to `git add` them so Makes can recognize
+them.
+
+### Adding yourself to the mailmap
+
+When contributing is important to add yourself to the
+[.mailmap](https://github.com/fluidattacks/makes/blob/main/.mailmap) file.
+Make sure to test it with `m . /lintGitMailMap`.
+
+### Validating commit message
+
+- Your commit message must follow this [syntax](https://github.com/fluidattacks/makes/tree/main/test/lint-commit-msg).
+- You can take a look at other commits [here](https://github.com/fluidattacks/makes/commits/main).
+- Make sure to test it with `m . /lintGitCommitMsg`.
+
+### DCO
+
+You must sign your commits by adding a `Signed-off-by` line at the end of your
+commit messages.
+
+Example:
+
+```
+feat(build): #1099 licensing builtin with reuse
+
+- Create `testLicense` builtin with reuse.
+- Add job to dev pipeline
+
+Signed-off-by: Robin Quintero <rohaquinlop301@gmail.com>
+```
+
+### Adding documentation
+
+All added features must be documented in the same PR.
+You can run `m . /docs/dev` to serve the [doc site](https://makes.fluidattacks.com)
+on localhost.
+
+### Other PR rules
+
+A PR must:
+
+- Only be one commit ahead of main.
+- Have a title and body equal to its commmit message.
+
 ### The legal side of contributions
 
 All of the code

test/lint-markdown/config.rb

@@ -9,7 +9,7 @@
 rule 'MD010'
 rule 'MD011'
 rule 'MD012'
-rule 'MD013', :tables => false, :code_blocks => false
+rule 'MD013', :tables => false, :ignore_code_blocks => true
 rule 'MD018'
 rule 'MD019'
 rule 'MD020'