lib-vt: docs

example/c-vt/README.md

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+# Example: `ghostty-vt` C Program
+
+This contains a simple example of how to use the `ghostty-vt` C library
+with a C program.
+
+This uses a `build.zig` and `Zig` to build the C program so that we
+can reuse a lot of our build logic and depend directly on our source
+tree, but Ghostty emits a standard C library that can be used with any
+C tooling.
+
+## Usage
+
+Run the program:
+
+```shell-session
+zig build run
+```