Update readme

Author: endurodave

README.md

@@ -35,6 +35,7 @@ A compact C++ finite state machine (FSM) implementation that's easy to use on em
 - [Multithread safety](#multithread-safety)
 - [Alternatives](#alternatives)
 - [Benefits](#benefits)
+- [Star History](#star-history)
 - [References](#references)
 
 
@@ -977,6 +978,12 @@ reinterpret_cast&lt;StateFunc&gt;(stateFunc)</pre>
 
 <p>I&rsquo;ve used variations of this code for self-test engines, a gesture recognition library, user interface wizards, and machine automation, among other projects. This implementation offers easy use for the inheriting classes. With the macros it lets you just &quot;turn the crank&quot; without much thought given to the underlying mechanics of how the state engine operates. This allows you more time to concentrate on more important things, like the design of the state transitions and state function implementation.</p>
 
+# Star History
+
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+[![Star History Chart](https://api.star-history.com/svg?repos=endurodave/StateMachine&type=Date)](https://star-history.com/#endurodave/StateMachine&Date)
+
 # References
 
 <ul>