Update the plugins managment. Add the function 'omz-plugin' (inspired from bash-it)

plugins/available/droplr/README.md

@@ -0,0 +1,19 @@
+# droplr
+
+Use [Droplr](https://droplr.com/) from the command line to upload files and shorten
+links. It needs to have [Droplr.app](https://droplr.com/apps) installed and logged
+in. MacOS only.
+
+To use it, add `droplr` to the `$plugins` variable in your zshrc file:
+
+```zsh
+plugins=(... droplr)
+```
+
+Author: [Fabio Fernandes](https://github.com/fabiofl)
+
+## Examples
+
+- Upload a file: `droplr ./path/to/file/`
+
+- Shorten a link: `droplr http://example.com`