Consolidate docs (#251)

* Consolidate sub-repo docs

docs/design/coreclr/botr/README.md

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+
+# The Book of the Runtime
+
+Welcome to the Book of the Runtime (BOTR) for the .NET Runtime.   This contains
+a collection of articles about the non-trivial internals of the .NET Runtime.   Its
+intended audience are people actually modifying the code or simply wishing to have a
+deep understanding of the runtime.
+
+Below is a table of contents.
+
+- [Book of the Runtime FAQ](botr-faq.md)
+- [Introduction to the Common Language Runtime](intro-to-clr.md)
+- [Garbage Collection Design](garbage-collection.md)
+- [Threading](threading.md)
+- [RyuJIT Overview](ryujit-overview.md)
+  - [Porting RyuJIT to other platforms](porting-ryujit.md)
+- [Type System](type-system.md)
+- [Type Loader](type-loader.md)
+- [Method Descriptor](method-descriptor.md)
+- [Virtual Stub Dispatch](virtual-stub-dispatch.md)
+- [Stack Walking](stackwalking.md)
+- [Mscorlib and Calling Into the Runtime](mscorlib.md)
+- [Data Access Component (DAC) Notes](dac-notes.md)
+- [Profiling](profiling.md)
+- [Implementing Profilability](profilability.md)
+- [What Every Dev needs to Know About Exceptions in the Runtime](exceptions.md)
+- [ReadyToRun Overview](readytorun-overview.md)
+- [CLR ABI](clr-abi.md)
+- [Cross-platform Minidumps](xplat-minidump-generation.md)
+- [Mixed Mode Assemblies](mixed-mode.md)
+
+
+It may be possible that this table is not complete.  You can get a complete list
+by looking at the directory where all the chapters are stored:
+
+* [All Book of the Runtime (BOTR) chapters on GitHub](../botr)