Dockerize it

DOCKER.md

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+Docker Instructions:
+====================
+
+The Dockerfile in this repo assumes a completely self-contained setup, where I2P resides in the same container as gitea.
+This is purely for simplicity's sake.
+In order to build it, use:
+
+```sh
+docker build -t go-i2p/go-gittisane .
+```
+
+then in order to run it, use:
+
+```sh
+docker run --name i2p-gittisane -d go-i2p/go-gittisane
+docker log i2p-gittinsane
+```