updates to starter readme

Author: raphaeltm

starter-sample/README.md

@@ -1,5 +1,7 @@
 # Starter Sample #REMOVE_ME_AFTER_EDITING
 
+[1-click deploy](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-<YOUR_SAMPLE_DIR#REMOVE_ME_AFTER_EDITING>-template%26template_owner%3DDefangSamples)
+
 This is a sample that shows the rough structure of an actual Defang sample. This top paragraph should give a bit of context about the project and what it does. The rest of the README should be a guide on how to use the sample. #REMOVE_ME_AFTER_EDITING
 
 ## Prerequisites
@@ -17,6 +19,15 @@ To run the application locally, you can use the following command:
 docker compose up
 ```
 
+## Configuration
+#REMOVE_ME_AFTER_EDITING - this section should be removed if there are no configuration values needed. The intro text can probably stay, but the list of configuration values should be updated/removed if there are none.
+
+For this sample, you will need to provide the following [configuration](https://docs.defang.io/docs/concepts/configuration). Note that if you are using the 1-click deploy option, you can set these values as secrets in your GitHub repository and the action will automatically deploy them for you.
+
+### `API_KEY` #REMOVE_ME_AFTER_EDITING
+An explanation of what the env var (`API_KEY`) is, etc.
+
+
 ## Deploying
 
 1. Open the terminal and type `defang login`