Add documentation for developing on syracuse tenants union website

.gitignore

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+node_modules/
+pass
+*.sw*

README.md

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+# Syracuse Tenants Union
+
+This is a squarespace theme for the syracuse tenants union.
+
+## Getting started
+_NOTE: You may need to be invited to the squarespace site for the below to work. If something below
+doesn't work and you get an error related to not having permissions to access something, etc, that
+might be the problem._
+
+1. Make sure you are using node >= 10.7. Run `node -v` and check.
+2. Run `npm install`.
+3. Run `npm start`, wait for the server to start.
+4. Visit `localhost:9000` in a web browser.
+
+## Deployment
+This project is set up with circleci so that when any commit is pushed to `master`, it is
+auto-deployed to the production squarespace site. This should hopefully make it easier for multiple
+people to work on this project at the same time.
+
+The circleci job takes two environment variables, `$SQUARESPACE_EMAIL` and `$SQUARESPACE_PASSWORD`
+which defines a set of login credentials that should be used when pushing the squarespace site.
+These are configured within circleci as they are secrets.