Add bash-completion notes

Author: mattiasb

README.md

@@ -18,6 +18,22 @@ $ make user-install # Install to ~/.local/bin
 $ make install      # Install to /usr/local/bin/
 ```
 
+### Bash completion
+
+If you installed git-fpaste with `make user-install` you need to add the following script to your `~/.bashrc` to get completion working.
+
+```bash
+function _load_completions {
+    for comp in "${1}"; do
+        if [ -f "${comp}" ] ; then
+            . $comp
+        fi
+    done
+}
+_load_completions `ls -w1 ${HOME}/.local/share/bash-completion/completions/*`
+```
+
+
 ## Usage
 
     Usage: git fpaste <command> [<args>]