add assets examples

examples/assets/README.md

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+# Assets (static files) server
+
+The example demonstrates how to use reproxy.io for static content serving
+
+- [embed](embed) is a Dockerfile embedding assets into container and serving them with reproxy.
+  Build it with `docker build -t example .` and run with `docker -it --rm -p 80:80 example`. Hit `http://localhost/index.html` (or `http://localhost`) and `http://localhost/1.html`. Alternatively use `docker-compose build && docker-compose up` 
+- [external](external) demonstrates how to serve assets from docker's volume (host's file system). The same as above, but you can also edit files inside `assets` and see the changed responses.

examples/assets/embed/Dockerfile

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+FROM umputun/reproxy:master
+ENV TIME_ZONE=America/Chicago
+COPY assets /web
+EXPOSE 80
+CMD ["/srv/reproxy", "--assets.location=/web", "--listen=0.0.0.0:80"]

examples/assets/embed/assets/1.html

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+1.html

examples/assets/embed/assets/index.html

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+index

examples/assets/embed/docker-compose.yml

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+services:
+  reproxy-embed:
+    build: .
+    container_name: reproxy-embed
+    hostname: reproxy-embed
+    ports:
+      - "80:80"
+    environment:
+      - LISTEN=0.0.0.0:8080
+      - ASSETS_LOCATION=/web

examples/assets/external/Dockerfile

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+FROM umputun/reproxy:master
+ENV TIME_ZONE=America/Chicago
+EXPOSE 80
+CMD ["/srv/reproxy", "--assets.location=/web", "--listen=0.0.0.0:80"]

examples/assets/external/assets/1.html

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+1.html

examples/assets/external/assets/index.html

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+index

examples/assets/external/docker-compose.yml

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+services:
+  reproxy-external:
+    build: .
+    container_name: reproxy-external
+    hostname: reproxy-external
+    ports:
+      - "80:80"
+    volumes:
+      - ./assets:/web
+    environment:
+      - LISTEN=0.0.0.0:8080
+      - ASSETS_LOCATION=/web