feature: add foundry's forge plugin

plugins/forge/README.md

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+## Forge plugin
+
+The Forge plugin provides completion and useful aliases for
+[Foundry Forge](https://getfoundry.sh/forge/overview), a command-line tool that tests, builds, and deploys
+smart contracts.
+
+To use it, add `forge` to the plugins array of your zshrc file:
+
+```zsh
+plugins=(... forge)
+```
+
+## Aliases
+
+| Alias     | Command          | Description              |
+| :-------- | :--------------- | :----------------------- |
+| `finit`   | `forge init`     | Initialize a new project |
+| `fb`      | `forge build`    | Build the project        |
+| `fcmp`    | `forge compile`  | Compile contracts        |
+| `ft`      | `forge test`     | Run tests                |
+| `fdoc`    | `forge doc`      | Generate documentation   |
+| `ffmt`    | `forge fmt`      | Format code              |
+| `fl`      | `forge lint`     | Lint code                |
+| `fsnap`   | `forge snapshot` | Create a snapshot        |
+| `fcov`    | `forge coverage` | Generate coverage report |
+| `ftree`   | `forge tree`     | Show dependency tree     |
+| `fcl`     | `forge clean`    | Clean build artifacts    |
+| `fgeiger` | `forge geiger`   | Run geiger (security)    |
+| `fcfg`    | `forge config`   | Show configuration       |
+| `fupd`    | `forge update`   | Update dependencies      |
+| `fbind`   | `forge bind`     | Generate bindings        |
+
+## Requirements
+
+This plugin requires [Foundry](https://book.getfoundry.sh/getting-started/installation) to be installed and
+the `forge` command to be available in your PATH.

plugins/forge/forge.plugin.zsh

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+# Foundry Forge plugin for oh-my-zsh
+
+# Aliases for common Foundry Forge commands
+alias finit='forge init'
+alias fb='forge build'
+alias fcmp='forge compile'
+alias ft='forge test'
+alias fdoc='forge doc'
+alias ffmt='forge fmt'
+alias fl='forge lint'
+alias fsnap='forge snapshot'
+alias fcov='forge coverage'
+alias ftree='forge tree'
+alias fcl='forge clean'
+alias fgeiger='forge geiger'
+alias fcfg='forge config'
+alias fupd='forge update'
+alias fbind='forge bind'
+
+# COMPLETION FUNCTION
+if (( ! $+commands[forge] )); then
+  return
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `forge`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_forge" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _forge
+  _comps[forge]=_forge
+fi
+
+# Generate completion file in the background
+forge completions zsh >| "$ZSH_CACHE_DIR/completions/_forge" &|