add code spell checker 4101 (#5751)

CONTRIBUTING.md

@@ -29,6 +29,7 @@ The following is a set of guidelines for contributing to the website repository,
     - [**1.6 Dev setup (6): Build and serve the website locally**](#16-dev-setup-6-build-and-serve-the-website-locally)
       - [**1.6.a Starting Docker**](#16a-starting-docker)
       - [**1.6.b Stopping Docker**](#16b-stopping-docker)
+    - [**1.7 Dev setup (7): Install local codebase spell checker**](#17-dev-setup-7-install-local-codebase-spell-checker)
   - [**Part 2: How the Website team works with GitHub issues**](#part-2-how-the-website-team-works-with-github-issues)
     - [**2.1 Hack for LA Contributor expectations**](#21-hack-for-la-contributor-expectations)
     - [**2.2 How Hack for LA organizes issues**](#22-how-hack-for-la-organizes-issues)
@@ -302,6 +303,15 @@ docker-compose up
 
 <sub>[Back to Table of Contents](#table-of-contents)</sub>
 
+### **1.7 Dev setup (7): Install local codebase spell checker**
+
+You must use VS Code as your local text editor to install the VS Code extension for spell checking your codebase, Code Spell Checker.
+
+The recommended installation method is to install Code Spell Checker directly from the VS Code text editor, and those instructions can be found [here](https://code.visualstudio.com/learn/get-started/extensions). The extension can also be installed via the VS Code Marketplace website [here](https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker). <strong><em>Feel free to reach out in the [Hack for LA Slack channel](https://hackforla.slack.com/messages/hfla-site/) if you have trouble installing the extension in VS Code.</em></strong>
+
+<sub>[Back to Table of Contents](#table-of-contents)</sub>
+
+
 ***
 
 ## **Part 2: How the Website team works with GitHub issues**