Add Nix support

tests/test_new.diff

@@ -320,3 +320,20 @@ index 0000000..525e25d
 +  ;; TODO: todo with description (sub-level)
 +  ;;  Body of the issue should stay here
 +  (str "hello" name))
+diff --git a/tests/example.nix b/tests/example.nix
+new file mode 100644
+index 0000000..a6c6cb0
+--- /dev/null
++++ b/tests/example.nix
+@@ -0,0 +1,11 @@
++{
++  # TODO add missing devices
++  stdDeviceList = [
++    "treads"
++    "grabber"
++  ];
++  /*
++    TODO add missing c
++  */
++  sum = a: b: a + b;
++}