Add README

README.md

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+A graphical interface for viewing the current pipewire graph (name pending, suggestions welcome), inspired by the JACK tool [catia](https://kx.studio/Applications:Catia).
+
+![Screenshot](screenshot.png)
+
+# Features planned
+
+- Allow creation of links from one port to another.
+- Color ports and links based on whether they carry audio, video or midi data.
+
+More suggestions are welcome!
+
+# Building
+For compilation, you will need:
+
+- An up-to-date rust toolchain
+- gtk-4.0 and pipewire-0.3 development headers
+
+To compile, run
+
+    $ cargo build --release
+
+in the repository root.
+The resulting binary will be at `target/release/graphui`.