docs: add readme

readme.md

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+This plugin for [TiddlyWiki 2.x](https://classic.tiddlywiki.com)
+makes it easy to jump from one open tiddler to another via hotkeys and
+an interface that also substitutes the "jump" command dropdown.
+
+It also adds quick access to some features, now supporting
+hotkeys to close or edit tiddlers from the jump list. See details inside the plugin.
+
+This plugin, like many others, are available to install via [ExtensionsExplorerPlugin](https://github.com/YakovL/TiddlyWiki_ExtensionsExplorerPlugin) (to find it, install the central collection and YLExtensionsCollection from it).