[Kaleidoscope][BuildingAJIT] Add stub Chapter 5 text.

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+=============================================================================
+Building a JIT: Remote-JITing -- Process Isolation and Laziness at a Distance
+=============================================================================
+
+.. contents::
+   :local:
+
+**This tutorial is under active development. It is incomplete and details may
+change frequently.** Nonetheless we invite you to try it out as it stands, and
+we welcome any feedback.
+
+Chapter 5 Introduction
+======================
+
+Welcome to Chapter 5 of the "Building an ORC-based JIT in LLVM" tutorial. This
+chapter introduces the ORC RemoteJIT Client/Server APIs and shows how to use
+them to build a JIT stack that will execute its code via a communications
+channel with a different process. This can be a separate process on the same
+machine, a process on a different machine, or even a process on a different
+platform/architecture. The code builds on top of the lazy-AST-compiling JIT
+stack from `Chapter 4 <BuildingAJIT3.html>`_.
+
+**To be done -- this is going to be a long one:**
+
+**(1) Introduce channels, RPC, RemoteJIT Client and Server APIs**
+
+**(2) Describe the client code in greater detail. Discuss modifications of the
+KaleidoscopeJIT class, and the REPL itself.**
+
+**(3) Describe the server code.**
+
+**(4) Describe how to run the demo.**
+
+Full Code Listing
+=================
+
+Here is the complete code listing for our running example that JITs lazily from
+Kaleidoscope ASTS. To build this example, use:
+
+.. code-block:: bash
+
+    # Compile
+    clang++ -g toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core orc native` -O3 -o toy
+    # Run
+    ./toy
+
+Here is the code for the modified KaleidoscopeJIT:
+
+.. literalinclude:: ../../examples/Kaleidoscope/BuildingAJIT/Chapter5/KaleidoscopeJIT.h
+   :language: c++
+
+And the code for the JIT server:
+
+.. literalinclude:: ../../examples/Kaleidoscope/BuildingAJIT/Chapter5/Server/server.cpp
+   :language: c++