Add example to README.md file

minion/README.md

@@ -9,6 +9,16 @@ This template can be used to bring up a minion and connect it to a OpenNMS core.
 * Modify `values.yaml` file:
 * (If you are using JKS) add a base64 value of Java Keystore into `content`. You can get the base64 value by running `cat jks/truststore.jks | base64`
 
+## How to add/override files under `etc` folder:
+* Add your files to `etc` folder (*Note:* We don't support folders/subdirectories in this folder)
+* Deploy the Helm Chart
+
+### Example:
+Adding a file called `hello.txt` to `etc` folder inside the minion container
+```
+$ echo "Hello World" > etc/hello.txt
+```
+
 ## Values
 
 | Key | Type | Default | Description |