Add a completion plugin for dnote (#7885)

plugins/dnote/README.md

@@ -0,0 +1,51 @@
+# Dnote Plugin
+
+This plugin adds auto-completion for [Dnote](https://dnote.io) project.
+
+To use it, add `dnote` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(dnote)
+```
+
+## Usage
+
+At the basic level, this plugin completes all Dnote commands.
+
+```zsh
+$ dnote a(press <TAB> here)
+```
+
+would result in:
+
+```zsh
+$ dnote add
+```
+
+For some commands, this plugin dynamically suggests matching book names.
+
+For instance, if you have three books that begin with 'j': 'javascript', 'job', 'js',
+
+```zsh
+$ dnote view j(press <TAB> here)
+```
+
+would result in:
+
+```zsh
+$ dnote v j
+javascript  job         js
+```
+
+As another example,
+
+```zsh
+$ dnote edit ja(press <TAB> here)
+```
+
+would result in:
+
+
+```zsh
+$ dnote v javascript
+``````