reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/routing/basic/README.md

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+# Basic Example
+
+The only requirement for this example is [Docker](https://docs.docker.com/install/).
+
+## Docker Compose
+
+The Docker Compose is pre-installed with Docker for Windows. For linux please follow the steps described at: https://docs.docker.com/compose/install/.
+
+Build and run the application for linux arch and expose it on http://localhost:8080.
+
+```sh
+$ docker-compose up
+```
+
+See [docker-compose file](docker-compose.yml).
+
+## Without Docker Compose
+
+1. Build the image as "myapp" (docker build)
+2. Run the image and map exposed ports (-p 8080:8080)
+3. Attach the interactive mode so CTRL/CMD+C signals are respected to shutdown the Iris Server (-it)
+4. Cleanup the image on finish (--rm)
+
+```sh
+$ docker build -t myapp . 
+$ docker run --rm -it -p 8080:8080 myapp:latest
+```