Update README.md

Author: Dlloydev

README.md

@@ -31,14 +31,23 @@ Development began with a fork of the Arduino PID Library. Some modifications and
 ### Functions
 
 [QuickPID::QuickPID Constructor](#QuickPID::QuickPID Constructor)
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 [Compute()](#Compute())
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 [SetTunings()](#SetTunings())
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 [SetSampleTime()](#SetSampleTime())
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 [SetOutputLimits()](#SetOutputLimits())
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 [SetMode()](#SetMode())
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 [Initialize()](#Initialize())
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 [SetControllerDirection()](#SetControllerDirection())
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 [Display Functions](#Display Functions())
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 [Utility Functions](#Utility Functions())
 
 ### Self Test Example (RC Filter):