Updated README.md

README.md

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 ![JMat: Matrices for Java](https://1.bp.blogspot.com/-HBB4foZmv4I/YPxmtma_HJI/AAAAAAAAAcY/TuLtrSs18VwJPzXNnTyyxJwWRYMOUY3dACLcBGAsYHQ/s928/Matrices+for+Java+Banner.png)
 JMat is a library developed for Java which allows for the use and manipulation of matrices. The library handles fundamental mathematical operations on matrices, and also implements further functionality including discretisation, I/O, and sorting.
+
+## JMat Core
+
+The core JMat package implements the basic matrix functionality for the whole library using three main types of matrix object: the generic matrix (`GMatrix`), the comparable matrix (`CMatrix`), and the double matrix (`DMatrix`). Using these matrix objects, use and manipulation of matrices is possible.
+
+## Building JMat
+
+To build the JMat library, first clone the Git main branch (which holds the latest version of JMat) using the command:
+
+	$ git clone https://github.com/JoshMcDonagh/JMat.git
+
+JMat uses Gradle as the build system, with each JMat package contained in sub-folders (there is only one that currently exists in this version):
+
+* *jmat.core* - this is the library package which contains the fundamental matrix functionality.
+
+Within the Git foler cloned, use the following command to build the JMat library and run all of the JUnit tests:
+
+	$ gradle build
+
+Alternatively, access https://github.com/JoshMcDonagh/JMat/releases for the latest version of the JMat library.
+
+## License
+
+```
+Copyright 2021 Joshua McDonagh
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```