Add knowledge on Finite State Machines

Author: josephrexme

javascript/miscellaneous.md

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+# Different parts of building a JS app
+
+#### Finite State Machines
+- [Simplifying Complex UIs with Finite Automata - David Khourshid (JSCONF Iceland)][1]
+- [Simplify state with FSM - Alberta Williams][2]
+- [Using React and XState to build a sign in form - CSSTricks][3]
+
+
+[1]: https://www.youtube.com/watch?v=RqTxtOXcv8Y
+[2]: https://x-team.com/blog/finite-state-machines-with-react/
+[3]: https://css-tricks.com/using-react-and-xstate-to-build-a-sign-in-form/