Readme for internals plugin

plugins/tiddlywiki/internals/readme.tid

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+title: $:/plugins/tiddlywiki/internals/readme
+
+This plugin adds features to help explore the internals of TiddlyWiki:
+
+* New preview panes showing:
+** the parse tree
+** the widget tree
+** the raw HTML output
+
+The first two include a dropdown for choosing block vs. inline parsing mode.