Add node modules and compiled JavaScript from main (#172)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/yargs/build/lib/is-promise.js

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isPromise = void 0;
+function isPromise(maybePromise) {
+    return !!maybePromise &&
+        !!maybePromise.then &&
+        (typeof maybePromise.then === 'function');
+}
+exports.isPromise = isPromise;