Create README.template.md

Author: ocots

README.template.md

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+# OptimalControl.jl
+
+<!-- 
+For instructions on how to customize this README.template.md and use the centralized workflow,
+please see the user guide: https://github.com/orgs/control-toolbox/discussions/67
+-->
+
+The OptimalControl.jl package is part of the [control-toolbox ecosystem](https://github.com/control-toolbox).
+
+<!-- INCLUDE_BADGES: Documentation, CI, Coverage, PackageEvaluation, Release, Citation, License, CodeStyle, Downloads -->
+
+<!-- INCLUDE_ABOUT -->
+
+<!-- INCLUDE_INSTALL -->
+
+<!-- INCLUDE_CONTRIBUTING -->