README: add

README.md

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+# Smeargle
+
+A tool for rendering text using bitmap images in PNG format, C version.
+
+# Build Requirements
+
+To build this project, you will need:
+
+- libtoml (tomlc99); an embedded copy is available as a fallback if a system version isn't.
+- libgd
+- meson
+- ninja
+
+Building `smeargle`:
+
+```sh
+meson setup . output
+meson compile
+```
+
+# License
+
+This program is released under the MIT license; a copy of this license is provided in `LICENSE.md`.
+