Add Readme

Author: hmG3

README.md

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+# Technical Analysis Library for .NET Core
+
+TALib.NETCore is an **unofficial** .NET Core port of the Technical Analysis Library (Ta-Lib) - open-source ANSI C library of functions for technical analysis of financial time series data. It has written entirely in C# for the .NET platform. This repository contains the source code of the last version of the library released under GNU Lesser General Public License v3.0. This makes it free to use, even in commercial projects, with some restrictions.
+
+[![License](https://img.shields.io/github/license/hmG3/TA-Lib.NETCore?logo=open-source-initiative)](https://opensource.org/licenses/LGPL-3.0)
+[![NuGet](https://img.shields.io/nuget/v/TALib.NETCore.svg?logo=nuget)](https://nuget.org/packages/TALib.NETCore)
+![Build Status](https://github.com/hmG3/TA-Lib.NETCore/workflows/.NET%20Core/badge.svg)
+[![Coverage Status](https://codecov.io/gh/hmG3/TA-Lib.NETCore/branch/master/graph/badge.svg)](https://codecov.io/gh/hmG3/TA-Lib.NETCore)
+
+## Supported Frameworks
+
+- netstandard2.1
+
+## Installation
+
+A compiled binary of TALib.NETCore 0.4 is provided by the `TALib.NETCore` NuGet package. To install it, run the following command in the Package Manager Console:
+
+```shell
+    Install-Package TALib.NETCore
+```
+
+or in .NET Core CLI:
+
+```shell
+    dotnet add package TALib.NETCore
+```
+
+## Updates and bug fixes
+
+For more recent versions please refer to:
+
+- [Homepage of TA-Lib](https://ta-lib.org/)
+- [Official SVN repository](https://svn.code.sf.net/p/ta-lib/code/trunk/ta-lib/c/)
+- [Unofficial GitHub repository "TA-Lib/ta-lib"](https://github.com/TA-Lib/ta-lib)