add test framework and a basic test

tests/data/content/.meta

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+# test setting a mime type
+index.gmi: text/gemini
+# test globs and setting parameters
+*.de.gmi: ;lang=de
+# test double star globs
+**/*.nl.gmi: ;lang=nl
+# test setting multiple parameters
+test.gmi: ;lang=en ;charset=us-ascii
+# test setting data for nonexistent files
+gone.txt: 52 This file is no longer available.
+# test setting data for files in other directories
+example.com/index.gmi: ;lang=en-US

tests/data/content/example.com/index.gmi

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+This is example.com.
+=> gemini://example.org

tests/data/content/example.org/index.gmi

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+This is example.org.
+=> gemini://example.com/

tests/data/content/index.gmi

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+This is a test index file.

tests/data/content/test.gmi

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+This is a test in the root
+Suppe

tests/data/content/testdir/.meta

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+# test distributed configurations
+index.gmi: 51 No index file for you.