Create README.md

README.md

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+# MatrixMath
+
+MatrixMath is a program for calculating matrices. She knows how to multiply, add, subtract, calculate the determinant and much more.
+
+# Build
+.NET Core 3.1
+```console
+  dotnet build -c Release
+```
+
+# Program features
+:white_check_mark: Matrix-to-matrix addition.
+
+:white_check_mark: Adding a matrix to a number.
+
+:white_check_mark: Subtracting another matrix from a matrix.
+
+:white_check_mark: Subtracting a number from a matrix.
+
+:white_check_mark: Multiplication of matrices by each other.
+
+:white_check_mark: Multiplying a matrix by a number.
+
+:white_check_mark: Calculation of the determinant.