Added manifests to use for creating source and binary distributions.

devtools/packaging/manifests/README.md

+# Manifests for automated packaging of source and binary distributions
+
+A detailed explanation of packaging protocols can be found on the developer wiki:
+https://github.com/pandegroup/openmm/wiki/Packaging-OpenMM-installers
+
+## Contents
+* `source/` - directories and files to be copied from the GitHub repo for a source distribution
+* `binary/` - directories and files to be copied from install directory after build for a binary distribution
+

devtools/packaging/manifests/binary/manifest.txt

+docs
+examples
+include
+lib
+licenses

devtools/packaging/manifests/source/manifest.txt

+cmake_modules
+CMakeLists.txt
+docs-source
+examples
+libraries
+olla
+openmmapi
+platforms
+plugins
+serialization
+tests
+wrappers