Add tmux package and common dotfiles deployment

dotfiles/common/.tmux/plugins/tmux/CONTRIBUTING.md

@@ -0,0 +1,43 @@
+# Contributing
+
+## Adding a module
+
+Follow the instructions from [custom](/custom), place the module in the appropriate
+directory and document the module in `README.md`.
+
+## Commit messages
+
+This repository uses [Conventional Commits](https://conventionalcommits.org).
+Commit headers should be lowercase. Most commits should include a body that briefly
+describes the motivation and content of the commit.
+
+### Commit types
+
+- `fix`: A bug fix that doesn't modify the public API
+- `feat`: A code change that modifies the public API
+- `refactor`: A code change that doesn't change behavior
+- `style`: A style fix or change
+- `docs`: Any change to documentation
+- `ci`: Any change to CI files
+- `revert`: A revert commit. The message should describe the reasoning and the
+  commit should include the `Refs:` footer with the short hashes of the commits
+  being reverted.
+- `chore`: catch-all type
+
+### Commit scopes
+
+Available commit scopes are module names, `status`, `pane`, and
+`window`. If none of these apply, omit the scope.
+
+### Breaking changes
+
+All breaking changes should be documented in the commit footer in the format
+described by Conventional Commits. Use the `<type>!` syntax in order to distinguish
+breaking commits in the log, but include the footer to provide a better description
+for the changelog generator.
+
+```
+feat(bar)!: foo the bars
+
+BREAKING CHANGE: bars are now foo'ed
+```