added isObject snippet

snippets/isObject.md

@@ -0,0 +1,16 @@
+### isObject
+
+Returns a boolean determining if the passed value is an object or not.
+
+```js
+const isObject = obj => obj === Object(obj);
+```
+
+```js
+isObject([1, 2, 3, 4]); // true
+isObject([]); // true
+isObject(['Hello!']); // true
+isObject({ a:1 }); // true
+isObject({}); // true
+isObject(true); // false
+```