chore: Change file layout to match repository instead of gist

README.md

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+yants
+=====
+
+This is a tiny type-checker for data in Nix, written in Nix.
+
+Features:
+
+* Checking of primitive types (`int`, `string` etc.)
+* Checking polymorphic types (`option`, `list`, `either`)
+* Defining & checking struct/record types
+* Defining & matching enum types
+* Defining & matching sum types
+* Defining function signatures (including curried functions)
+* Types are composable! `option string`! `list (either int (option float))`!
+* Type errors also compose!
+
+Lacking:
+
+* Any kind of inference
+* Convenient syntax for attribute-set function signatures
+
+## Primitives & simple polymorphism
+
+![simple](screenshots/simple.png)
+
+## Structs
+
+![structs](screenshots/structs.png)
+
+## Nested structs!
+
+![nested structs](screenshots/nested-structs.png)
+
+## Enums!
+
+![enums](screenshots/enums.png)
+
+## Functions!
+
+![functions](screenshots/functions.png)