Add a simple README

README.txt

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+lofivor
+=======
+
+sandbox stress test for measuring entity rendering performance on weak hardware.
+written in zig with raylib.
+
+build & run
+-----------
+
+    zig build run
+
+controls
+--------
+
+    +/-      add/remove 1000 entities
+    shift    hold for 10x (10000 entities)
+    space    pause/resume
+    r        reset
+
+output
+------
+
+benchmark.log is written to project root with frame timing data.