add readme (#5)

README.MD

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+![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/ConcreteEcho/FluentStructures/nuget.yml)
+![GitHub issues](https://img.shields.io/github/issues/ConcreteEcho/FluentStructures)
+![Nuget](https://img.shields.io/nuget/v/Fluent.Structures.Model)
+
+# Wrappers for the Tekla API with a Fluent interface
+
+A set of classes for convenient interaction with the Tekla API.
+
+> At the moment, the library is intended only for Tekla 2022.
+
+Classes from the following libraries are currently implemented:
+
+- Tekla.Structures.Model — Beam, RebarGroup, Polygon, Plate;
+
+# Motivation
+
+The original Tekla API provides a small set of overloads for methods, moreover, these overloads contain non-recommended
+classes (such as ArrayList). The construction of a complex object can take hundreds of lines.   
+The purpose of this library is to simplify the creation of objects by providing a Fluent interface and implement more
+reliable checks of the necessary attributes.
+
+# How do i build this?
+
+You must have installed .NET SDK 7.0. Then cd to the root directory and
+
+```shell
+dotnet build
+```