[lit] Add a README.txt.

- Also, update MANIFEST.in and utils/check-sdist.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203497 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/MANIFEST.in

@@ -1,7 +1,9 @@
 include TODO lit.py
 recursive-include tests *
+recursive-include examples *
 global-exclude *pyc
 global-exclude *~
 prune tests/Output
 prune tests/*/Output
 prune tests/*/*/Output
+prune tests/*/*/*/Output

utils/lit/README.txt

@@ -0,0 +1,8 @@
+===============================
+ lit - A Software Testing Tool
+===============================
+
+lit is a portable tool for executing LLVM and Clang style test suites,
+summarizing their results, and providing indication of failures. lit is designed
+to be a lightweight testing tool with as simple a user interface as possible.
+

utils/lit/utils/check-sdist

@@ -12,6 +12,7 @@ find . | \
     grep -v '^\./dist' | \
     grep -v '^\./utils' | \
     grep -v '^\./venv' | \
+    grep -v '^\./notes.txt' | \
     grep -v '^\./lit.egg-info' | \
     grep -v '^\./lit/ExampleTests' | \
     grep -v '/Output' | \