Initial population of readme

README.md

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-# htmlon
-HTMLon is a JavaScript-powered and highly customisable rich text editor that attaches itself seamlessly to a textarea element.
+# HTMLON
+
+HTMLON (pronounced HT-em-elon, like the, er, fruit) is a JavaScript-powered rich text editor in the vein of (but much simpler and smaller than) Tiny MCE. It doesn't really need to exist; yet it does, so here we are.
+
+**HTMLON is based on `execCommand()`, which is deprecated. This project is therefore no longer maintained.**
+
+For all usage and examples see https://mitya.uk/projects/htmlon#examples