Create README.md

references #16

Author: HLWeil

README.md

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+# ISADotNet
+ISA compliant experimental metadata toolkit in F#
+
+The library contains types and functionality for creating and working on experimental metadata in ISA format. 
+Additionally, the types can easily be written to and read from `Json` files in [ISAJson format](https://isa-specs.readthedocs.io/en/latest/isajson.html) and Microsoft `Excel` files in [ISATab format](https://isa-specs.readthedocs.io/en/latest/isatab.html).
+
+
+
+# Installation
+
+The `ISADotNet` nuget package can be found [here](https://www.nuget.org/packages/ISADotNet/)
+
+The `ISADotNet.XLSX` nuget package can be found [here](https://www.nuget.org/packages/ISADotNet.XLSX/)
+
+Adding a package reference via dotnet:
+`dotnet add package ISADotNet --version 0.1.0`
+
+Adding a package reference in F# interactive:
+`#r "nuget: ISADotNet, 0.1.0"`
+
+# What is ISA?
+
+ISA is a specification for annotation of research data. The metadata in nested in three different layers: <b>I</b>nvestigation, <b>S</b>tudy and <b>A</b>ssay.
+
+Around these three main entities, the following abstract datamodel is specified:
+
+![Abstract Datamodel](https://isa-specs.readthedocs.io/en/latest/_images/isa_model_1_ccoded.png)
+Source: https://isa-specs.readthedocs.io/en/latest/_images/isa_model_1_ccoded.png
+
+Additional Info: https://isa-specs.readthedocs.io/en/latest/isamodel.html
+
+# Usage
+