Add new items implemented
Added License
Added Common Project

A library to keep common and helper methods
Added PriorityQueue and BinaryHeap implementation
Code clean up and formatting
Added DataStructure.Test project

New project to test data structures.
Added PriorityQueueTest and BinaryHeapTest
Add reference to common
Added NUnit NuGet package
Added New Projects and Enable NuGet Package Restore

Added Common.csproj and DataStructure.csproj
Updated to latest VisualStudio.gitignore

This add supports to ignore NuGet packages folder in case NuGet package
restore option is set