Build Project Structure.

New: base classes and modules.
New: unit tests.

core/base/ResultBase.py

@@ -0,0 +1,2 @@
+class ResultBase():
+    pass

core/base/SimulationBase.py

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+import abc
+
+
+class SimulationBase():
+    @abc.abstractclassmethod
+    def run(self):
+        pass
+
+    pass

core/base/__init__.py

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+from .ResultBase import ResultBase
+from .SimulationBase import SimulationBase

tests/test_base.py

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+import unittest
+
+from haocrowd.core.base import SimulationBase
+
+
+class TestBase(unittest.TestCase):
+
+    def test_basic(self):
+        class MySim(SimulationBase):
+            def run(self) -> str:
+                return "HelloSim"
+
+        mysim = MySim()
+        self.assertEqual(mysim.run(), "HelloSim")
+
+
+if __name__ == "__main__":
+    unittest.main()