📚 Add documentation and metadata for new tools: just, rg, and xh

rg/CHEATSHEET.md

@@ -0,0 +1,20 @@
+# rg
+
+## Meta
+
+```yaml
+name: rg
+aliases: ripgrep
+repo: https://github.com/burntsushi/ripgrep
+description: ripgrep recursively searches directories for a regex pattern while respecting your gitignore
+```
+
+## Install
+
+```shell
+$ cargo install ripgrep
+```
+or
+```shell
+$ cargo binstall ripgrep
+```