Create README.md

README.md

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+This is a utility for merging two NuGet packages _(two .NET Framework Versions)_ into a single nupkg package _(Multi-TargetFrameworks)_.
+
+### +Usage+
+
+**NupkgMerge**.exe **-p**{"[rimary](rimary)"} "+primary.nupkg+" **-s**{"[econd](econd)"} "+second.nupkg+" **-o**{"[ut](ut)"} "+output.nupkg+"
+
+* **-P**{"[rimary](rimary)"}
+: Specifies the primary nupkg file to merge from. _(Higher Priority)_
+* **-S**{"[econd](econd)"}
+: Specifies the second nupkg file to merge from. _(Lower Priority)_ Only those items_(metadata/files)_ which are not in the primary nupkg file will be included in the output nupkg file.
+* **-O**{"[ut](ut)"}
+: Specifies the file name of new nupkg package for the merged output.
+
+
+To merge more than two packages into a single package, please execute NupkgMerge in iterations. _(Pass the previous output file into the next iteration's primary file argument)_
+
+For source package created from a **csproj** or **vbproj** file, the auto-generated flat list of package dependencies will be **grouped** into a corresponding targetFramework group _(if the source package supports a unique .NET Framework)_ while merging.
+
+.