Add isPlainObject

snippets/isPlainObject.md

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+### isPlainObject
+
+Checks if the provided value is an bbject created by the Object constructor.
+
+Check if the provided value is truthy, use `typeof` to check if it is an object and `Object.constructor` to make sure the constructor is equal to `Object`.
+
+```js
+const isPlainObject = val => !!val && typeof val === 'object' && val.constructor === Object;
+```
+
+```js
+isPlainObject({ 'a': 1 }); // true
+isPlainObject(new Map()); // false
+```