add bbin install docs

README.md

@@ -37,6 +37,30 @@ A CLI tool for making commits to many subrepos after a distributed change.
 
 ## Installation
 
+### Using bbin (Recommended)
+
+Install directly from Gitea using SSH:
+
+```bash
+# Install from your Gitea repository via SSH
+bbin install git@git.ajet.fyi:ajet-industries/commitly.git
+
+# Install a specific version using a git tag
+bbin install git@git.ajet.fyi:ajet-industries/commitly.git --git/tag v1.0.0
+
+# Install the latest commit
+bbin install git@git.ajet.fyi:ajet-industries/commitly.git --latest-sha
+```
+
+This will install `commitly` to `~/.local/bin/commitly` (make sure `~/.local/bin` is in your PATH).
+
+**Note:** Requires [bbin](https://github.com/babashka/bbin) to be installed first:
+```bash
+bash < <(curl -s https://raw.githubusercontent.com/babashka/bbin/main/bbin)
+```
+
+### Manual Installation
+
 ```bash
 # Make the script executable
 chmod +x commitly