Add busy-beaver-3 Turing machine definition

machines/busy-beaver-3.json

@@ -0,0 +1,15 @@
+{
+  "states": ["A", "B", "C", "halt"],
+  "alphabet": ["0", "1"],
+  "blank": "0",
+  "start": "A",
+  "halt": "halt",
+  "transitions": {
+    "A:0": ["B", "1", "R"],
+    "A:1": ["C", "1", "L"],
+    "B:0": ["A", "1", "L"],
+    "B:1": ["B", "1", "R"],
+    "C:0": ["B", "1", "L"],
+    "C:1": ["halt", "1", "S"]
+  }
+}