Merge pull request #484 from russellhadley/Milestones

Add initial Bring up Milestones markdown.

Documentation/llilc-milestones.md

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+# LLILC Bring up Milestones
+
+To meet the overarching goal of fully functional JIT and AOT code 
+generators we've broken out some intermediate milestones that we 
+think are good steps along the way.  Each of these milestones represent 
+a new level of functionality or robustness on the way to a production 
+quality tool.
+
+### Milestones
+* **"Hello World"** - Using LLILC, JIT all the methods for runtime start-up
+   and "Hello World" console app execution.  This is the classic first
+   app. Success is that the CLR comes up, and prints "Hello World" and
+   exits cleanly.
+* **corefx tests on Windows** - Run corefx unit tests as an integration test. This
+  tests a broad set of framework functionality. Success is a clean
+  test run using run-test from the corefx repo.
+* **corefx tests on Linux** - Same as above just on Linux.
+* **JIT SelfHost on Linux** - Pass ~6k Jit SelfHost tests on Linux.
+  These tests are currently being added to coreclr. Success will
+  be running clean for the whole set.
+* **JIT SelfHost Stress on Linux** - Pass ~6k JIT SelfHost tests under GCStress.
+  This will do basic validation of the GC implementation.
+* **Roslyn on Linux** - Full Roslyn compiling itself for CoreCLR on Linux with
+  the JIT.
+* **AOT Roslyn on Linux** - Full Roslyn compiling itself as a command line
+  AOT tool.
+
+We'll cross these off as we get through them but we're evaluating open issues 
+with respect to how fixing them will advance these goals.
+
+Note:  To add a milestone to this list open an issue to start the discussion,
+ then create a PR for a community review.