Add README

Author: elshize

README.md

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+# SimRs
+
+This is an experimental discrete event simulation library I use in my research project.
+I'm not sure at the moment how much value it has for others but I found the things I did
+here interesting, so maybe someone else will as well.
+
+Visit https://docs.rs/simrs/0.1.0/simrs/ for more information and documentation.
+
+If you have any comments, suggestions, or criticism, don't hesitate to reach out
+by either contacting me directly or opening an issue.