Update CONTRIBUTING.md

[kurtmgray]

Fixes #replace_this_text_with_the_issue_number

What changes did you make and why did you make them ?

• Added reminder to install dependencies prior to attempting to run the application

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

no screenshots

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From your project repository, check out a new branch and test the changes.

git checkout -b hackforla-install-deps development
git pull https://github.com/hackforla/VRMS.git install-deps

[trillium]

Hey Kurt, thanks for the edit!

FYI we use yarn, if you're intalling with NPM it will generate a new package-lock.json instead of using the current yarn.lock file

[trillium]

Directions on installing via yarn is covered in section 2.3.4 here:

1. Install the node packages needed in each directory:

   - `cd vrms/` and run `yarn install`
   - `cd client` and run `yarn install`
   - `cd ../backend` and run `yarn install`

We would welcome a section that mentions common issues in getting started or something if you'd like to make a note about installation there :)