Add docker support

Dockerfile

@@ -0,0 +1,9 @@
+FROM    python:3.6.2
+
+RUN     mkdir -p /freqtrade
+WORKDIR /freqtrade
+
+ADD     ./requirements.txt /freqtrade/requirements.txt
+RUN     pip install -r requirements.txt
+ADD     . /freqtrade
+CMD     python main.py

README.md

@@ -51,3 +51,11 @@ $ source .env/bin/activate
 $ pip install -r requirements.txt
 $ ./main.py
 ```
+
+
+#### Docker
+```
+$ cd freqtrade
+$ docker build -t freqtrade .
+$ docker run --rm -it freqtrade
+```