add deno completions

Signed-off-by: 迷渡 <justjavac@gmail.com>

README.md

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+# oh-my-zsh Deno plugin
+
+> The oh-my-zsh-deno plugin provides completion as well as adding many useful aliases.
+
+## Installation
+
+Clone or download in your oh-my-zsh custom plugin directory:
+
+```shell
+git clone git@github.com:denodev/oh-my-zsh-deno.git ~/.oh-my-zsh/custom/plugins/deno
+```
+
+Add in your plugins list in `~/.zshrc`:
+
+```zsh
+plugins=(... deno)
+```
+
+Restart your terminal application to refresh context and use the plugin. Alternatively, you can source your current shell configuration:
+
+```shell
+source ~/.zshrc
+```
+
+## Aliases
+
+| Alias    | Command         | Descripton                                                                   |
+|:------   |:----------------|:-----------------------------------------------------------------------------|
+| `denoa`  | `deno run -A`   | BRun a program given a filename or url to the module, allow all permissions  |
+| `denob`  | `deno bundle`   | Bundle module and dependencies into single file                              |
+| `denoc`  | `deno cache`    | Cache the dependencies                                                       |
+| `denod`  | `deno doc`      | Show documentation for a module                                              |
+| `denoe`  | `deno eval`     | Eval script                                                                  |
+| `denof`  | `deno fmt`      | Format source files                                                          |
+| `denoi`  | `deno install`  | Install script as an executable                                              |
+| `denor`  | `deno run`      | Run a program given a filename or url to the module                          |
+| `denot`  | `deno test`     | Run tests                                                                    |
+| `denoup` | `deno upgrade`  | Upgrade deno executable to newest version                                    |
+
+### License
+
+oh-my-zsh-deno is released under the MIT License. See the bundled [LICENSE](./LICENSE) file for details.

deno.plugin.zsh

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+(( $+commands[deno] )) && {
+  deno completions bash > "${ZSH_CACHE_DIR:-$ZSH/cache}/deno_completions"
+  source "${ZSH_CACHE_DIR:-$ZSH/cache}/deno_completions"
+}
+
+# Run a program given a filename or url to the module, allow all permissions
+alias denoa="deno run -A "
+
+# Bundle module and dependencies into single file
+alias denob="deno bundle"
+
+# Cache the dependencies
+alias denoc="deno cache"
+
+# Show documentation for a module
+alias denod="deno doc"
+
+# Eval script
+alias denoe="deno eval"
+
+# Format source files
+alias denof="deno fmt"
+
+# Install script as an executable
+alias denoi="deno install"
+
+# Run a program given a filename or url to the module
+alias denor="deno run"
+
+# Run tests
+alias denot="deno test"
+
+# Upgrade deno executable to newest version
+alias denoup="deno upgrade"