docs overhaul: move git cli instructions to a separate file

CONTRIBUTING.md

@@ -72,38 +72,12 @@ refer to the [style guide](./STYLEGUIDE.md).
 
 ## Submitting a pull request
 
-For submitting changes, you can use whatever workflow you're more comfortable with.
-
-### Using Github's web interface
-
 The easiest way to submit a change is to just edit the page directly on the Github interface.
 Check out the step-by-step instructions (with screenshots) on
 [Github Help](https://help.github.com/articles/editing-files-in-another-user-s-repository/).
 
-### Using the command line
+Alternatively, you can do most of the process
-
+[using git on the command line](contributing-guides/git-terminal.md).
-Alternatively, you can do most of the process using the command line:
-
-- fork the repository on the github web interface
-
-- clone your fork locally:  
-  `git clone https://github.com/{{your_username}}/tldr.git && cd tldr`
-
-- create a feature branch, e.g. named after the command you plan to edit:  
-  `git checkout -b {{branch_name}}`
-
-- make your changes (edit existing files or create a new one)
-
-- commit the changes:  
-  `git commit --all -m "{{commit_message}}"`
-
-- push to your fork:  
-  `git push origin {{branch_name}}`
-
-- go to the github page for your fork and click the green pull request button.
-
-Please send only related changes in the same pull request.
-Typically a pull request will include changes in a single file.
 
 ### Commit message
 

contributing-guides/git-terminal.md

@@ -0,0 +1,24 @@
+Most people submit pull requests to the tldr project using GitHub's web interface.
+
+If you prefer, you can do most of the process using the command line instead:
+
+- fork the repository on the github web interface
+
+- clone your fork locally:  
+  `git clone https://github.com/{{your_username}}/tldr.git && cd tldr`
+
+- create a feature branch, e.g. named after the command you plan to edit:  
+  `git checkout -b {{branch_name}}`
+
+- make your changes (edit existing files or create a new one)
+
+- commit the changes:  
+  `git commit --all -m "{{commit_message}}"`
+
+- push to your fork:  
+  `git push origin {{branch_name}}`
+
+- go to the github page for your fork and click the green pull request button.
+
+Please send only related changes in the same pull request.
+Typically a pull request will include changes in a single file.