lang/linux-dotnet-(runtime|sdk): add linux implementation of .NET Core
- add LTS versions
- Dotnet Core 2.1 fails due to issue with linprocfs (PR pending)
.NET Core is a free and open-source managed software framework. It consists of
CoreCLR, a complete runtime implementation of CLR, the virtual machine that
manages the execution of .NET programs. CoreCLR comes with an improved
just-in-time compiler, called RyuJIT. .NET Core also includes CoreFX, which is
a partial fork of FCL. While .NET Core shares a subset of .NET Framework APIs,
it comes with its own API that is not part of .NET Framework. Further,
.NET Core contains CoreRT, the .NET Native runtime optimized to be integrated
into AOT compiled native binaries. A variant of the .NET Core library is used
for UWP. .NET Core's command-line interface offers an execution entry point
for operating systems and provides developer services like compilation and
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