docs(typst): Add README

typst/README.md

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+# Decasify package for Typst
+
+A thin wrapper around the *decasify* crate providing Typst functions for locale and style guide aware text casing functions.
+Provides functionns for title-case (and other cases) that adapt to the language of the current document context.
+Includes support for Turkish and multiple style guides.
+
+```typst
+#import "decasify.typ": titlecase
+#set text(lang: "tr")
+#titlecase("ilk ışıltı")
+```