Updates to README.md for DIPUM Toolbox 3 release

README.md

@@ -1 +1,28 @@
-# dipum-toolbox
+# DIPUM Toolbox 3
+
+DIPUM Toolbox 3 contains MATLAB functions were created for the book *Digital Image Processing Using MATLAB*, 3rd edition, by R.C. Gonzalez, R.E. Woods, and S.L. Eddins, Gatesmark, 2020.  The functions supplement and extend the image processing functionality of [MATLAB](https://www.mathworks.com/products/matlab.html) and [Image Processing Toolbox](https://www.mathworks.com/products/image.html), 
+both offered by [MathWorks](https://mathworks.com).
+
+For other information and support files for *Digital Image Processing Using MATLAB*, see the associated [website](http://imageprocessingplace.com).
+
+## License
+
+DIPUM Toolbox is copyright 2002-2020 Gatesmark. It is provided under what is known as the *BSD-3-Clause* open-source license. See the [license file](https://github.com/dipum/dipum-toolbox/blob/master/LICENSE.txt) for details.
+
+Note that some functions in the DIPUM Toolbox are provided under separate open-source licenses. See the `license.txt` files in the relevant folders.
+
+## Requirements
+
+This release of the DIPUM Toolbox works with R2016b or later of MATLAB and Image Processing Toolbox.  The DIPUM Toolbox is not supported for use with earlier versions of MATLAB or Image Processing Toolbox. Most DIPUM functions require Image Processing Toolbox.
+
+The DIPUM Toolbox works with all MATLAB platforms.  It includes one MEX-file (UNRAVEL, which is used for Huffman decoding).  Compiled binaries for this MEX-file are provided for all MATLAB platforms.
+
+## Installation
+
+To install the DIPUM Toolbox, go to the [releases area](https://github.com/dipum/dipum-toolbox/releases) and download the latest dipum-toolbox.mltbx file. In MATLAB, navigate to the folder containing the downloaded file and double-click on it in the MATLAB Current Folder Browser. An installer will open to guide you through the installation process.
+
+Alternatively, download the latest code from the [DIPUM Toolbox
+repository](https://github.com/dipum/dipum-toolbox) and add all the
+code folders to the MATLAB Search Path. In the MATLAB HOME tab, click
+on Set Path. Then, click on "Add with Subfolders..." and select the
+top-level folder containing the DIPUM Toolbox files.