chore: updating the contributing docs

Author: jherr

CONTRIBUTING.md

@@ -13,8 +13,10 @@
   - Dependencies inside of the packages and examples are automatically linked together as local/dynamic dependencies.
 - Run the build
   - `pnpm build`
-- Build an example app with the builder
-  - `pnpm start app-js`
+- Build an example app with the builder. This is actually a little trick because if you build an app in the monorepo it will inherit the monorepo setup and won't work. So you need to have a temporary directory outside of the monorepo to create apps. An example test command command is below. The `-C` flag is used to the working directory of PNPM to the root of the CLI code, and the `--target-dir` flag is used to specify to the CLI the directory to create the app in.
+  - `pnpm -C [root of the monorepo]/cli/create-tsrouter-app start --target-dir [temporary directory path]/app-js app-js`
+- Since you will probably be working on `./packages/cta-engine` a lot, you can run the following command to start the CLI in watch mode. After you have built the code at the root with `pnpm build`, you can run the following command to start the CLI in watch mode.
+  - `cd ./packages/cta-engine && pnpm dev`
 - Run the `app-js` app just to make sure it works
 - Make changes to the code
   - Re-run `pnpm build` and `pnpm start` (in all its configurations) to make sure the changes work