add Dockerfile and scripts for containerized obfsvpn

This is based on github.com/dockovpn/docker-openvpn repository, it adds the
obfsvpn-server binary and config file to the original image

a directory can be bind mounted to /opt/Dockovpn_data to persist data
client.ovpn config file is created in /opt/Dockovpn/client/<client-id>/client.ovpn

it recognises the following environment variables:
  OBFS4_HOST = 0.0.0.0 (default) # This is the OBFS4 server endpoint
  OBFS4_PORT = 4430
  HOST_ADDR = localhost # openvpn gateway ip
  PORT = 5540 # openvpn GW port
  PROTO = tcp # openvpn proto

1 files changed, 31 insertions, 0 deletions

diff --git a/images/obfsvpn/README.md b/images/obfsvpn/README.md
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+## Dockerized obfs4 and openvpn in a single container
+
+This is based on the [dockovpn/docker-openvpn](https://github.com/dockovpn/docker-openvpn) repository, it adds the `obfsvpn-server`
+binary and the required config files to start an instance of the server targetting the
+`openvpn` server running at port 5540 (default)
+
+A directory can be bind mounted to `/opt/Dockovpn_data` to persist the configurations of the
+`openvpn` server and additionally to copy out the `client.ovpn` file created at `/opt/Dockovpn/client/<client-id>/client.ovpn`
+
+The container recognises the following environment variables and can be used to override the
+default values:
+
+```
+OBFS4_HOST = 0.0.0.0 (default) # This is the OBFS4 server endpoint
+OBFS4_PORT = 4430
+HOST_ADDR = localhost # openvpn gateway ip
+PORT = 5540 # openvpn GW port
+PROTO = tcp # openvpn proto
+```
+
+### To test locally
+
+```
+$ make obfsvpn-server-container
+```
+
+Then run the container using the following command:
+
+```
+$ docker run -it --rm --privileged -p 4430:4430/tcp leap/obfsvpn:0.1
+```