Update Getting Started

Right now the Getting Started section in the README is a bit outdated.

People who are just getting started with this library are not likely to have all of the dependencies needed (latest version of VS, .NET Core, etc.) to compile the source code and demo application.

I am looking for people newer to this project to either comment or submit a PR with suggestions on how to improve this.

Some ideas to consider:

• Getting started section so that it is as simple as possible for someone new to the library.
• Consider including a link to my examples repo
• Consider moving up the link to the releases page with the pre-compiled demo app from the See It In Action section
• Remove the Source Code section and instead simply link over to the wiki page

README の Getting Started、See It In Action、Building the Source セクションと、リンクされている Compiling From Source wiki ページを確認します。オンボーディングの案内を更新し、前提条件とコンパイル済みデモを見つけやすくするとともに、ソースからのビルド手順が wiki を参照するようにします。新規参加者が古いセットアップ情報に惑わされず、ドキュメントに記載された手順に従える状態になれば完了です。