Adds groestlcoin_hash module recipe

This recipe depends on python3crystax, and has only been tested with
python3.6 crystax, but should work with 3.5 too.
Tested under provided Dockerfile and compiled fine with:
```
python setup_testapp_python3.py apk --sdk-dir /opt/android/android-sdk
--ndk-dir /opt/android/crystax-ndk --requirements
python3crystax,setuptools,android,groestlcoin_hash
```

Author: tshirtman

pythonforandroid/recipes/groestlcoin_hash/__init__.py

@@ -0,0 +1,12 @@
+from pythonforandroid.recipe import CythonRecipe
+
+
+class GroestlcoinHashRecipe(CythonRecipe):
+    version = '1.0.1'
+    url = 'https://github.com/Groestlcoin/groestlcoin-hash-python/archive/{version}.tar.gz'
+    depends = ['python3crystax']
+    call_hostpython_via_targetpython = True
+    cythonize = False
+
+
+recipe = GroestlcoinHashRecipe()