add crystal plugin

plugins/crystal/README.md

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+# Crystal plugin
+
+This plugin adds aliases for common commands used in dealing with [Crystal](https://crystal-lang.org) and [Crystal shards](https://crystal-lang.org/reference/the_shards_command/index.html) - package manager.
+
+To use it, add `crystal` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... crystal)
+```
+
+## Aliases
+
+| Alias | Command                   | Description                                                    |
+|:------|:--------------------------|:---------------------------------------------------------------|
+| cry   | `crystal`                 | language executable.                                           |
+| cryb  | `crystal build`           | build an executable.                                           |
+| crybr | `crystal build --release` | build an executable (Compile in release mode).                 |
+| cryr  | `crystal run`             | build and run program.                                         |
+| cryrr | `crystal run --release`   | build and run program (Compile in release mode).               |
+| crys  | `crystal spec`            | build and run specs.                                           |
+| crysr | `crystal spec --release`  | build and run specs (Compile in release mode).                 |
+| sha   | `shards`                  | shard executable.                                              |
+| shac  | `shards check`            | Verify all dependencies are installed.                         |
+| shai  | `shards install`          | Install dependencies, creating or using the `shard.lock` file. |
+| shal  | `shards list`             | List installed dependencies.                                   |
+| shao  | `shards outdated`         | List dependencies that are outdated.                           |
+| shap  | `shards prune`            | Remove unused dependencies from `lib` folder.                  |
+| shau  | `shards update`           | Update dependencies and `shard.lock`.                          |
+| shav  | `shards version`          | Print the current version of the shard.                        |

plugins/crystal/crystal.plugin.zsh

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+# General
+
+alias cry="crystal"
+
+# Build
+
+alias cryb="crystal build"
+alias crybr="crystal build --release"
+
+# Run
+alias cryr="crystal run"
+alias cryrr="crystal run --release"
+
+# Spec
+alias crys="crystal spec --order rando"
+alias crysu="crystal spec"
+
+# Shards
+alias sha="shards"
+alias shac="shards check"
+alias shai="shards install"
+alias shal="shards list"
+alias shao="shards outdated"
+alias shap="shards prune"
+alias shau="shards update"
+alias shav="shards version"