Create README.md
Rename Theme_3_CoreVars.ipynb to Theme_1_CoreVars.ipynb
Rename Theme_3_CoreVars.py to Theme_1_CoreVars.py
Rename Theme1Models.ipynb to Scenario_1A_Model_Strings.ipynb
Rename Theme_1_CoreVars.ipynb to Scenario_1B_CoreVariable_Strings.ipynb
Rename Theme_1A.ipynb to Scenario_1C_WebService_Strings.ipynb
First commit for DO Nutrients notebook