Update README for to do next

Code/Control/Laptop_Code/README.md

 [Progress] The overall logic is clear and tested! 
 
-Working on it
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-![IO_digram](./README-asset/IO_digram.png)
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-Main_control() 
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-* to be continued
+What to do next in python main:
+
+- Have keyboard interruption in the python function
+  -  To tweak PID value while running the program
+  - To stop the balloon from being crazy 
+- The meter version April tag detection is still problematic so we need to tune that 
+- Use field test experiment to test PID
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