feat: update README.md

README.md

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 # tools-api
 This FastAPI app has various utilities to help streamline local development for Platform Engineers that are working on the GlueOps Platform. This tool is not meant for customers or any end users of the GlueOps Platform.
+
+## Setup
+
+1. Launch codespace
+2. Configure environment variables (see below)
+3. Run `devbox run dev` and follow outputted steps to get started.
+
+### Required environment variables:
+
+```bash
+AWS_GLUEOPS_ROCKS_ORG_ACCESS_KEY
+AWS_GLUEOPS_ROCKS_ORG_SECRET_KEY
+AWS_LIGHTSAIL_ACCESS_KEY
+AWS_LIGHTSAIL_SECRET_KEY
+GITHUB_TOKEN
+MINIO_S3_ACCESS_KEY_ID
+MINIO_S3_SECRET_KEY
+```