Initial checkin of gRPC to third_party/

third_party/grpc/vsprojects/coapp/openssl/README.md

+OpenSSL Native Nuget package
+-------------------------
+
+Uses [CoApp](http://coapp.org/) project to build the zlib package.
+
+Prerequisites
+-------------
+Multiple versions of VS installed to be able to build all the targets:
+* Visual Studio 2015
+* Visual Studio 2013
+* Visual Studio 2010 (you might need SP1 to prevent LNK1123 error)
+
+ActivePerl
+
+CoApp toolkit: http://downloads.coapp.org/files/CoApp.Tools.Powershell.msi
+
+More details on installation: http://coapp.org/tutorials/installation.html
+
+Building
+--------
+
+Build all flavors of openssl library using the provided batch file.
+```
+buildall.bat
+```
+
+Then, create NuGet package using powershell (you'll need the CoApp toolkit installed):
+```
+[THIS_DIRECTORY]> Write-NuGetPackage grpc.dependencies.openssl.autopkg
+```
+
+This will create three NuGet packages:
+* the main dev package
+* the redistributable package that contains just the binaries and no headers
+* the symbols package (debug symbols)
+
+Later, you can push the package to NuGet.org repo.
+Attention: before pusing the resulting nuget package to public nuget repo, you have to be 100% sure it works correctly - there’s no way how to delete or update an already existing package.