Add description of the project

ReadMe.md

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 IJP ImageJ Launcher
 ===================
 
+IJP ImageJ Launcher is native launcher that starts [ImageJ 2] or [Fiji].
+It is intended to be a general drop-in replacement for the original [ImageJ Launcher].
+IJP ImageJ Launcher is a clean implementation on the core function of starting [ImageJ 2] or [Fiji].
 
-Features
+
+Why Another ImageJ Launcher
+---------------------------
+I needed to use Fji with the current versions of Java, version 11 and newer.
+The original [ImageJ Launcher] works with Java 8, but not that well with the current versions,
+in particular not well on Mac with Arm64 processors (Apple Silicon).
+I attempted to fix the original [ImageJ Launcher source].
+The source is burdened by technical debt,
+the logic flow is too complex to correct without a significant rewrite.
+
+
+Features [work in progress]
 --------
 
-* Launches ImageJ2 or Fiji
+* Uses similar options to the original ImageJ Launcher, si IJP Launcher can be drop-in replacement
+* Provides native executable for various OS/Hardware systems
+    - Windows
+    - Mac OS X Arm64 (Apple Silicon)
+    - Mac OS X Intel
+    - Linux
+* Selects location of ImageJ directory
+    - Startup directory or
+    - Directory specified by `--ij-dir` command line option
+* Locates Java Virtual Machine for ImageJ:
+    - Use Java VM requested the by the use (`--java-home`)
+    - Use `JAVA_HOME` environment variable
+    - Search ImageJ directory for available Java executables
+* Determines the amount of memory used by JVM based on total system memory use 75% of the max
+* Determines available `imagej-launcher*.jar`
+* Performs updates pending after last time ImageJ was closed
+
+### Full list of command line options
+
+```
+  -h, --help          prints this usage text
+  --version           prints version
+  --dry-run           show the command line, but do not run anything
+  --info              informational output
+  --debug             verbose output
+  --java-home <path>  specify JAVA_HOME explicitly
+  --print-java-home   print ImageJ's idea of JAVA_HOME
+  --ij-dir <path>     set the ImageJ directory to <path> (used to find jars/, plugins/ and macros/)
+```
+
+Installation
+------------
+The IJP ImageJ Launcher executables will be available on the [Releases] page.
+
+
+[//]: # (Links)
+
+[Fiji]: https://imagej.net/software/fiji/
+
+[ImageJ 2]: https://imagej.net/software/imagej2/
+
+[ImageJ Launcher]:https://imagej.net/learn/launcher
+
+[ImageJ Launcher source]:https://github.com/imagej/imagej-launcher/