Readme files updates

src/README.md

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+# Core Concepts
+
+## Brief Introduction
+This file explains the concepts of States and strategies, needed to modify the different programs. 
+
+## State concepts
+The emulator operates on a state machine with three core states:
+* **Standby**: The equipment is idle but ready.
+* **Running**: The equipment is active and operational.
+* **Fail**: The equipment has encountered a fault condition.
+* **Other**: It's possible to add more states, but new states need to be generated in the core library as well; consider use the 3 basic states before adding more.
+
+## Strategy concepts
+The emulator is able to run different predefined strategies to control the modbus registers, this is the list of available strategies:
+* **Single Value**: This strategy will set a value to a setpoint, it has the option to add noise to the value.
+* **Random**: Random value between 0 and 100, can be used to L1 testing.
+* **Ramp**: The selected value is going to be adjusted in a constant step rate, to a setpoint, setpoint can be updated in execution time.
+* **Saw Wave**: Moves the value between two sepoints with constart increments, once it reaches the limit it will reverse direction.
+* **Square Wave**: Constant change between two sepoints with instant change between them.
+* **PID**: Full PID controller, you need to give a output, input and setpoint modbus address, PID calculate the output based on the input and the PID constants.
+* **Totalizer**: Constant increment of a value, to emulate run hours. 
+For more details read the specific strategy implementation