Actually add the documentation

src/core/ext/README.md

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+Optional plugins for gRPC Core: Modules in this directory extend gRPC Core in
+useful ways.
+
+NOTE: The movement of code between lib and ext is an ongoing effort, so this
+directory currently contains too much of the core library.

src/core/ext/resolver/README.md

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+# Resolver
+
+Implementations of various name resolution schemes.

src/core/ext/transport/README.md

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+Transports for gRPC

src/core/ext/transport/chttp2/README.md

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+CHTTP2 - gRPC's implementation of a HTTP2 based transport

src/core/lib/README.md

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+Required elements of gRPC Core: Each module in this directory is required to
+build gRPC.
+
+NOTE: The movement of code between lib and ext is an ongoing effort, so this
+directory currently contains too much of the core library.

src/core/lib/channel/README.md

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+# Channel
+
+Provides channel/call stack implementation, and implementation of common filters
+for that implementation.

src/core/lib/iomgr/README.md

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+# iomgr
+
+Platform abstractions for I/O (mostly network).
+
+Provides abstractions over TCP/UDP I/O, file loading, polling, and concurrency
+management for various operating systems.

src/core/lib/surface/README.md

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+# Surface
+
+Surface provides the bulk of the gRPC Core public API, and translates it into
+calls against core components.

src/core/lib/transport/README.md

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+# Transport
+
+Common implementation details for gRPC Transports.
+
+Transports multiplex messages across some single connection. In ext/ there are
+implementations atop [a custom http2 implementation](/src/core/ext/transport/chttp2/README.md)
+and atop [cronet](/src/core/ext/transport/cronet/README.md).

src/core/lib/tsi/README.md

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+# Transport Security Interface
+An abstraction library over crypto and auth modules (typically OpenSSL)