document build steps

Author: lalitb

docs/building-with-vcpkg-cmake-windows.md

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+# Building 1DS C++ SDK with cmake on Windows
+
+### Pre-requisite:
+
+ - Windows SDK for C++
+ - CMake
+
+### Steps:
+
+1. Clone the repo
+
+PS C:\> git clone https://github.com/microsoft/cpp_client_telemetry.git
+
+
+2. Fetch the submodules (specifically the vcpkg port):
+
+PS C:\cpp_client_telemetry> git submodule update --init
+
+3. Create CMake configuration
+
+PS C:\cpp_client_telemetry> mkdir build
+PS C:\cpp_client_telemetry> cd build
+PS C:\cpp_client_telemetry\build>   cmake -DCMAKE_TOOLCHAIN_FILE=..\tools\vcpkg\scripts\buildsystems\vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows ..
+
+4. Run CMake build
+
+PS C:\cpp_client_telemetry\build>  cmake --build .
+
+This should build the 1DS C++ library, along with the functional and unit tests in `build` folder
+
+