document maintainer tasks in MAINTAINING.md file

MAINTAINING.md

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+Maintaining Math.NET Numerics
+=============================
+
+*Note: This document is only relevant for the maintainers of this project*
+
+When creating a new release
+---------------------------
+
+Repository:
+
+- Update RELEASENOTES file with relevant changes, attributed by contributor (if external). Set date.
+- Update CONTRIBUTORS file (via `git shortlog -sn`)
+- Create and publish a new annotated git tag for the release.
+- Consider to resync the subtree in the native provider repository
+- Consider to update all the repository mirrors (codeplex, gitorious, google)
+
+Publish:
+
+- Generate manual release build from internal TeamCity
+- Update release notes in NuGet packages (using package explorer)
+- Create new codeplex release, attach Zip files
+- Upload NuGet packages to the NuGet Gallery
+
+Misc:
+
+- Consider a tweet via @MathDotNet
+- Consider a post to the Google+ site
+- Update Wikipedia release version+date for the [Math.NET Numerics](http://en.wikipedia.org/wiki/Math.NET_Numerics) and [Comparison of numerical analysis software](http://en.wikipedia.org/wiki/Comparison_of_numerical_analysis_software) articles.
+- Regenerate api reference (at numerics.mathdotnet.com/api) using [docu](https://github.com/cdrnet/docu) and deploy to website.
+- Update documentation if necessary
+- Consider blog post about changes