added simple ols model

requirements.txt

@@ -10,3 +10,4 @@ pytest-cov
 pytest-html
 pydot
 mock
+statsmodels
\ No newline at end of file

src/model_modules/linear_model.py

+__author__ = "Felix Kleinert, Lukas Leufen"
+__date__ = '2019-12-11'
+
+
+import statsmodels.api as sm
+
+
+def ordinary_least_squared_model(x, y):
+    ols_model = sm.OLS(y, x)
+    return ols_model.fit()