Added examples and documentation for the published docker image

docker/examples/simple/README.md

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+# Standalone GEDCOM Container Example
+
+This example builds a self-contained image that hosts a single `.ged` file directly (no photos).
+
+## Instructions
+
+1. Put your GEDCOM file in this directory and name it `family.ged`.
+2. Build your custom container:
+   ```bash
+   docker build -t my-simple-tree .
+   ```
+3. Run your container:
+   ```bash
+   docker run -d -p 8080:8080 my-simple-tree
+   ```