docs: writing some shell documentation

README.md

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+# MfGames CIL (C# and .NET) Libraries
+
+This [monorepo](https://en.wikipedia.org/wiki/Monorepo) is the collection of all Moonfire Games's libraries for languages supported by the [Common Intermediate Language](https://en.wikipedia.org/wiki/Common_Intermediate_Language) (CIL), also known as .NET and C#. Some of these libraries have roots back into development since 2001 and they have gone through a number of iterations.
+
+## Documentation
+
+The documentation for the entire project can be found in the [./docs/ folders](./docs/index.md) of this registry, but below are some notable links there.
+
+- [MfGames.Gallium](./docs/gallium/index.md) - A toy Entity-Component-System (ECS) modeled after LINQ methods calls and suitable for environment where ease of use is more critical than performance.
+- [MfGames.Nitride](./docs/nitride/index.md) - A flexible, configuration-as-code, static site generator build on top of MfGames.Gallium.
+
+## Installing Packages
+
+These packages are not available on NuGet.org, but are available through the MfGames package register for this project. The best way to use them is to configure the `NuGet.config` file in the root of the project.
+
+```xml
+<!-- NuGet.Config --
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+    <add key="mfgames.com" value="https://src.mfgames.com/api/packages/mfgames-cil/nuget/index.json" protocolVersion="3" />
+  </packageSources>
+  <packageSourceMapping>
+    <packageSource key="nuget.org">
+      <package pattern="*" />
+    </packageSource>
+    <packageSource key="mfgames.com">
+      <package pattern="MfGames.*" />
+    </packageSource>
+  </packageSourceMapping>
+</configuration>
+```