Adds docs for @codegen.function decorator (#187)

#Motivation
<!-- Why is this change necessary? -->
To provide clear documentation on how to use the function decorator
within the codegen SDK, including examples of deploying and running
functions using the CLI.
#Content
<!-- Please include a summary of the change -->
Added a new document function-decorator.mdx in the building-with-codegen
directory. This document includes usage instructions, examples, and CLI
commands for deploying and running functions.
#Testing

<!-- How was the change tested? -->
Reviewed the documentation for accuracy and clarity. Verified that the
links to related documents are correct.
Please check the following before marking your PR as ready for review
[x] I have added tests for my changes
[x] I have updated the documentation or added new documentation as
needed
[x] I have read and agree to the Contributor License Agreement
---

Author: kopekC

docs/building-with-codegen/function-decorator.mdx

@@ -0,0 +1,53 @@
+---
+title: Function Decorator
+sidebarTitle: "@codegen.function"
+icon: "at"
+iconType: "solid"
+---
+
+# Function Decorator
+
+The `function` decorator is used to define codegen functions within your application. It allows you to specify a name for the function that will be ran making it easier to run specific codemods
+
+## Usage
+
+To use the `function` decorator, simply annotate your function with `@codegen.function` and provide a name as an argument.
+
+### Example
+
+```python
+@codegen.function('my-function')
+def run(codebase):
+    pass
+```
+
+In this example, the function `run` is decorated with `@codegen.function` and given the name `'my-function'`. This name will be used when the function is ran.
+
+## Parameters
+
+- `name` (str): The name of the function to be used when ran.
+
+## Description
+
+The `function` decorator is part of the codegen SDK CLI and is used to mark functions that are intended to be ran as part of a code generation process. It ensures that the function is properly registered and can be invoked with the specified name.
+
+
+## CLI Examples
+
+### Running a Function
+
+To run a deployed function using the CLI, use the following command:
+
+```bash
+codegen run my-function
+```
+
+This command runs the function named `my-function`.
+
+## See Also
+
+- [Webhook Decorator](./webhook-decorator.mdx): For handling webhook events with decorators.
+- [Codebase Visualization](./codebase-visualization.mdx): For visualizing codebases in your application.
+- [CLI Init Command](../cli/init.mdx): For initializing projects or environments related to the function decorator.
+- [CLI Create Command](../cli/create.mdx): For creating new functions or projects using the CLI.
+- [CLI Run Command](../cli/run.mdx): For running code or scripts using the CLI.

docs/mint.json

@@ -97,6 +97,7 @@
 				"building-with-codegen/parsing-codebases",
 				"building-with-codegen/reusable-codemods",
 				"building-with-codegen/dot-codegen",
+				"building-with-codegen/function-decorator",
 				"building-with-codegen/language-support",
 				"building-with-codegen/commit-and-reset",
 				"building-with-codegen/git-operations",