Add Dockerfile.pi for building docker image for raspberry pi

requirements-pi.txt

@@ -0,0 +1,23 @@
+ccxt==1.18.270
+SQLAlchemy==1.2.18
+python-telegram-bot==11.1.0
+arrow==0.13.1
+cachetools==3.1.0
+requests==2.21.0
+urllib3==1.24.1
+wrapt==1.11.1
+scikit-learn==0.20.2
+joblib==0.13.2
+jsonschema==2.6.0
+TA-Lib==0.4.17
+tabulate==0.8.3
+coinmarketcap==5.0.3
+
+# Required for hyperopt
+scikit-optimize==0.5.2
+
+# find first, C search in arrays
+py_find_1st==1.1.3
+
+#Load ticker files 30% faster
+python-rapidjson==0.7.0