Added .NET Innovation sample draft for Generics

[kuhlenh]

Working on creating educational examples of topical .NET Innovations across the language and runtime. This is my first draft for the Generics example.

[dnfclas]

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[akoeplinger]

You can just wrap the statements in single backticks instead of wrapping them intags, then you can get rid of escaping the< >` as well.

[richlander]

There are plenty of explicit uses of generics, too. List and Dictionary<K,V> have to be among the most popular .NET classes. Also, people do use IEnumberable directly, too.

I'd lead more with the explicit cases of generics being useful and then follow with the implicit cases.

Before generics, everyone was using ArrayList and then casting all the time. That requirement is now gone.

[richlander]

We should decide on a good pattern for the title that we can use for the other documents you have planned. I need to think about that a bit. I'm hesitant to pivot on "innovation". Certainly, we built many features that are innovations, however, we'll want the ability to document a feature that doesn't cleanly fit as an "innovation" . It will be an exercise for the reader on which ones were truly innovative at the time they were released.

How about:

.NET Feature: Generics

[richlander]

@kuhlenh What do you want to do with this PR? Would be good to keep it moving.

[dnfclas]

@kuhlenh, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

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[richlander]

Moving to https://github.com/dotnet/core-docs.