Update README.md

Author: pilliamw

README.md

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-# <img src="img/lunaLogo.svg" alt="drawing" width="25"/> LunaSim: A Lightweight, Web-Based, System Dynamics Modelling Software
+# <img src="img/favicons/lunaLogo.svg" alt="drawing" width="25"/> LunaSim: A Lightweight, Web-Based, System Dynamics Modelling Software
 > :warning: LunaSim uses the [GoJS Library](https://gojs.net/), which is free for non-commercial, non-production use.  For commercial/production use, please obtain a license from them.
 
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+### **Try a demo here: [lunasim.org](https://lunasim.org)**
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 [System dynamics modeling](https://systemdynamics.org/what-is-system-dynamics/) is the process of graphically outlining various elements and their interactions in a complex system (which often represents real-world mechanisms) and 
 simulating them to get theoretical results on how that system will play out over a period of time. LunaSim allows the user to model using system dynamics (specifically [stock-
 and-flow diagrams](https://thesystemsthinker.com/step-by-step-stocks-and-flows-converting-from-causal-loop-diagrams/)) in the browser.