Add setup.py

This will allow building of a wheel for *taiga-back*

setup.py

@@ -0,0 +1,15 @@
+from setuptools import find_packages, setup
+
+setup(
+    name='taiga-back',
+    use_scm_version=True,
+    description='taiga-back',
+    url='https://taiga.io/',
+    license='GPL-3',
+    packages=find_packages(
+        exclude=['tests', 'tests.*'],
+    ),
+    setup_requires=[
+        'setuptools_scm',
+    ],
+)