Add examples

examples/proxy/python/README.md

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+# Python
+
+- proxy.py: methods to call proxy
+- rpc_{client,server}.py: RPC client/server
+- http_{client,server}.py: HTTP client/server
+
+## RPC Example
+
+Run proxy
+```shell
+micro proxy
+```
+
+Run server
+```shell
+# serves Say.Hello
+python rpc_server.py
+```
+
+Run client
+```shell
+# calls go.micro.srv.greeter Say.Hello
+python rpc_client.py
+```
+
+## HTTP Example
+
+Run proxy with proxy handler
+```shell
+micro proxy --handler=http
+```
+
+Run server
+```shell
+# serves /greeter
+python http_server.py
+```
+
+Run client
+```shell
+# calls /greeter
+python http_client.py
+```