Add README

concurrency/README.md

@@ -0,0 +1,22 @@
+# ConCurrency
+
+[Live App](https://karx.xyz/rgl/concurrency/)
+
+## Running Locally
+1. Install dependencies
+    ```bash
+    cd /path/to/concurrency
+    yarn install
+    ```
+2. Build project (be sure to supply the API_URL environment variable)
+    - Linux/MacOS:
+        ```bash
+        API_URL=https://v6.exchangerate-api.com/v6/api-key/latest/USD/ yarn build
+        ```
+    - Windows:
+        I'm not sure how to set environment variables on Windows, if anyone does, PRs are welcome!
+3. Open in browser
+    
+    Simply open the `index.html` file in the `public/` directory.
+
+<small>Created using [exchangerate-api](https://exchangerate-api.com) and React with TypeScript.</small>