Add a readme file

README.md

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+# Simple PV Simulator
+
+Feature list:
+
+- []Draw the entire year's electricity consumption figure.
+- []Draw the entire year's energy generation figure.
+- []Draw a heatmap of the system profit in different configurations.
+- []Calculate the probability of a successful run.
+- []Read the configs from the file, including `time granularity`, 
+  - ess: `capacity`, `cost per kW`, `charge power`, `discharge power`, `loss`
+  - pv: `capacity`, `cost per kW`, `loss`
+  - grid: `capacity`, `sell price`
+  - file:
+    - `lightintensity.xlsx`: record the light intensity. Value in the file should be between 0 and 1
+    - `factory_power.xlsx`: record the power consumption in the factory. Default time granularity is `15min`
+    - `combined_data.csv`: This file is generated by the Python script, including the `light` `intensity`, `factory_power`, `time`. 
+- []GUI.