Stub out klee project.

git-svn-id: https://llvm.org/svn/llvm-project/klee/trunk@67019 91177308-0d34-0410-b5e6-96231b3b80d8

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+//===----------------------------------------------------------------------===//
+// Klee Symbolic Virtual Machine
+//===----------------------------------------------------------------------===//
+                                                             Daniel Dunbar
+
+klee is a symbolic virtual machine built on top of the LLVM compiler
+infrastructure. Currently, there are two primary components.
+
+1. The core symbolic virtual machine engine; this is responsible for
+executing LLVM bitcode modules with support for symbolic values. This
+is comprised of the code in lib/.
+
+2. An emulation layer for the Linux system call interface, with
+additional support for making parts of the operating environment
+symbolic. This is found in models/simple.
+
+Additionally, there is a simple library in runtime/ which supports
+replaying computed inputs on native code. There is a more complicated
+library in replay/ which supports running inputs computed as part of
+the system call emulation layer natively -- setting up files, pipes,
+etc. on the native system to match the inputs that the emulation layer
+provided.
+
+For further information, see the docs in www/.