Add scaffold of first assignment

task_1_html_css/README.md

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+# Local Development
+
+see [src/README.md](src/README.md)
+
+# Local Testing
+
+## run container for local testing
+
+```bash
+docker build -t my-webapp .
+
+docker run -it --rm -p 5173:5173 my-webapp
+```
+Open a browser and connect to http://localhost:5173
+
+## run bash in interactive container
+```bash
+docker build -t my-webapp src/.
+
+docker run -it --rm -p 5173:5173 my-webapp bash
+```