[misc] gitignore, constants

.gitignore

@@ -0,0 +1 @@
+node_modules

constants.js

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+const path = require('path');
+const home = require('os').homedir();
+
+module.exports = {
+	MARK_DIR: path.join(home, '/.mark'),
+	MARK_RC: path.join(home, '/.markrc'),
+}