Added icon and OS4 readme file

README_OS4.md

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+# Lite XL for AmigaOS 4.1 FE
+
+Lite XL is coming to AmigaOS 4.1. This is a preview release for my supporters and not ready for public
+release, so please do not share it yet.
+
+A lot of things are not quite working. Please have a look at the todo list below, for known bugs and
+things I want to develop.
+
+## Installation
+Before you run Lite XL you have to set an ENV variable setting your HOME, if you haven't done that yet.
+A folder will be created in there with your user configuration.
+
+You can check if there is one set with
+```
+GetEnv HOME
+```
+If there is one set, then you will see the path at the output.
+
+Otherwise, you can set one using the following command. Change the path to the one of your preference.
+```
+SetEnv SAVE HOME "Sys:home/"
+```
+
+
+## TODO list
+- Free lost Gfx memory
+- Make the keyboard shortcuts work. Now, everything can be done with mouse clicks at the toolbar at the bottom of the file list at the left.
+- If `HOME` is not set, set it to program folder on program run, having that as an ENV variable, without saving it (only in ENV:)
+- Make the application aknowledge of the executable file name. Now it works only with the filename `lite`
+- Add Amiga versionings
+- Fix the resolution of the fullscreen mode
+- Fix load file when add an Amiga path at the search line
+- Add menu items
+- Create a MorphOS port