start documenting manual tests

tests/README.md

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+Manual testcases
+----------------
+
+This directory contains various files and programs for manual testing of issues
+discovered in the past.
+
+
+Text files
+==========
+
+Just run `cat filename` in Konsole to verify that they are working. If
+rendering related, open in a competent graphical text editor to compare and/or
+in other terminal emulators.
+
+ - [Decomposed hangul: Testcase for commit 43744097](textfiles/text-files/decomposed-hangul.txt)
+ - [Characters available in 9x15, encoded in UTF-8](text-files/9x15.repertoire-utf8)
+ - [Box characters](text-files/boxes.txt)
+ - [Various URLs](text-files/cat_test_urls)
+ - [UTF-8 test file from the Kermit project](text-files/GLASS.utf8)
+ - [Emojis](text-files/emoji_test.txt)
+ - [Markus Kuhn's UTF-8 sample](text-files/UTF-8-demo.txt)

tests/text-files/decomposed-hangul.txt

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+ཧྐྵྨླྺྼྻྂ
+