Add README.md for archived runtime packages (#570)

* Add README.md for archived runtime packages

* package -> library

diff --git a/src/libraries/Microsoft.CSharp/README.md b/src/libraries/Microsoft.CSharp/README.md
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+# Microsoft.CSharp library
+
+We are not accepting feature contributions to Microsoft.CSharp.
+The library is effectively archived.
+
+The library and supporting language features are mature and no longer evolving, and the risk of code change likely exceeds the benefit.
+We will consider changes that address significant bugs or regressions, or changes that are necessary to continue shipping the binaries.
+Other changes will be rejected.
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diff --git a/src/libraries/Microsoft.VisualBasic.Core/README.md b/src/libraries/Microsoft.VisualBasic.Core/README.md
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+# Microsoft.VisualBasic.Core library
+
+We are not accepting feature contributions to Microsoft.VisualBasic.Core.
+The library is effectively archived.
+
+The library and supporting language features are mature and no longer evolving, and the risk of code change likely exceeds the benefit.
+We will consider changes that address significant bugs or regressions, or changes that are necessary to continue shipping the binaries.
+Other changes will be rejected.
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diff --git a/src/libraries/System.Dynamic.Runtime/README.md b/src/libraries/System.Dynamic.Runtime/README.md
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+# System.Dynamic.Runtime library
+
+We are not accepting feature contributions to System.Dynamic.Runtime.
+The library is effectively archived.
+
+The library and supporting language features are mature and no longer evolving, and the risk of code change likely exceeds the benefit.
+We will consider changes that address significant bugs or regressions, or changes that are necessary to continue shipping the binaries.
+Other changes will be rejected.
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diff --git a/src/libraries/System.Linq.Expressions/README.md b/src/libraries/System.Linq.Expressions/README.md
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+# System.Linq.Expressions library
+
+We are not accepting feature contributions to System.Linq.Expressions.
+The library is effectively archived.
+
+The library and supporting language features are mature and no longer evolving, and the risk of code change likely exceeds the benefit.
+We will consider changes that address significant bugs or regressions, or changes that are necessary to continue shipping the binaries.
+Other changes will be rejected.
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