update readme

README.md

@@ -1,3 +1,29 @@
 ### ynab-exporter
 
-A simple Prometheus exporter for You Need A Budget (YNAB) budgeting data.
+A simple Prometheus exporter for [You Need A Budget](https://www.ynab.com)(YNAB) budgeting data.
+
+### How do I get started? 
+
+- Build the Docker image
+
+```bash
+    # replace sathyabhat/ynab-exporter with your own tag
+    docker build . -t sathyabhat/ynab-exporter 
+```
+
+- Export the following environment variables:
+
+  * `YNAB_TOKEN` - API token from [YNAB](https://api.ynab.com/).
+  * `BUDGET_ID` - The id corresponding to your YNAB budget. Soon, this exporter will fetch and publish data from all budgets.
+
+- Run the exporter
+
+```bash
+docker run --rm -e YNAB_TOKEN -e BUDGET_ID -p -d sathyabhat/ynab-exporter
+```
+
+The exporter will start listening on the port that you provide as a `PORT` environment variable, or on 9100 if you don't provide it. 
+
+### Feedback/suggestions
+
+If you have any feedback/suggestions, please [open a Github issue](https://github.com/SathyaBhat/ynab-exporter/issues/new).