Create README.md

Author: hleb-albau

src/Regula.DocumentReader.NetCoreExample/README.md

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+# Regula Document Reader csharp client compatible with .net core2.0+ and .netframework 4.6.1+
+
+:bulb: Before you start: if you just want to play with an online demo, visit our [playground](https://api.regulaforensics.com).
+
+:warning: NOTE: If a custom Document Reader endpoint is not specified, demo web API will be used by default.
+By sending requests to demo Regula Document Reader web API, 
+you agree with our [Privacy Policy](https://regulaforensics.com/en/company/privacy/) 
+and [License Agreement](https://downloads.regulaforensics.com/work/SDK/doc/Eula.pdf).