Add README

README

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+Switcher is a an entry to 6AMES MADE QUICK???, a game jam set during AGDQ 2022.
+
+Switcher is developed for the Sortix platform, and requires features from the
+staging branch / volatile builds. It targets the current staging APIs as of
+2022-10-16.
+
+Controls
+--------
+Left arrow key  - left
+Right arrow key - right
+Space           - jump
+R               - rebind controls
+
+Building
+--------
+Switcher can be built and installed either with make directly:
+
+    make && make install
+
+or with tix-build (executed from the parent directory):
+
+    tix-build switcher/ && tix-install switcher.tix.tar.xz
+
+Self-made levels
+----------------
+If switcher is launched with a single command line argument, it tries to load a
+level bundle from the specified file. See the file example-bundle.txt for
+format.