Initial readme

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14871 91177308-0d34-0410-b5e6-96231b3b80d8

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+LLVM Target Skeleton
+--------------------
+
+This directory contains a very simple skeleton that can be used as the
+starting point for new LLVM targets.  Basically you can take this code
+and start filling stuff in.
+
+This directory contains mainly stubs and placeholders; there is no binary 
+machine code emitter, no assembly writer, and no instruction selector 
+here.  Most of the functions in these files call abort() or fail assertions 
+on purpose, just to reinforce the fact that they don't work.
+
+The things that are implemented are stubbed out in a pseudo-PowerPC target.
+This should give you an idea of what to do, but anything implemented should
+be replaced with your target details.
+
+As always, if you're starting a new port, please mention it on the llvmdev
+list, and if you have questions, that is a great place to ask.
+