docs: updated contributing guidelines to easily contribute (shadcn-ui#1830)

## Explanation
Added detailed info to clone and setup the project to contribute.

Following the PR shadcn-ui#1650 and suggestion of @shadcn.  Thanks!

Author: william-monroy

CONTRIBUTING.md

@@ -45,15 +45,31 @@ packages
 
 ## Development
 
-### Start by cloning the repository:
+### Fork this repo
 
+You can fork this repo by clicking the fork button in the top right corner of this page.
+
+### Clone on your local machine
+
+```bash
+git clone https://github.com/your-username/ui.git
 ```
-git clone git@github.com:shadcn-ui/ui.git
+
+### Navigate to project directory
+
+```bash
+cd ui
 ```
 
-### Install dependencies
+### Create a new Branch
 
+```bash
+git checkout -b my-new-branch
 ```
+
+### Install dependencies
+
+```bash
 pnpm install
 ```
 
@@ -65,13 +81,13 @@ You can use the `pnpm --filter=[WORKSPACE]` command to start the development pro
 
 1. To run the `ui.shadcn.com` website:
 
-```
+```bash
 pnpm --filter=www dev
 ```
 
 2. To run the `shadcn-ui` package:
 
-```
+```bash
 pnpm --filter=shadcn-ui dev
 ```
 
@@ -134,13 +150,10 @@ the following categories:
 
   e.g. `feat(components): add new prop to the avatar component`
 
-
 If you are interested in the detailed specification you can visit
 https://www.conventionalcommits.org/ or check out the
 [Angular Commit Message Guidelines](https://github.com/angular/angular/blob/22b96b9/CONTRIBUTING.md#-commit-message-guidelines).
 
-
-
 ## Requests for new components
 
 If you have a request for a new component, please open a discussion on GitHub. We'll be happy to help you out.