add a functions that deeply cleans json objects from unwanted keys

snippets/json-cleaner.md

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+### Clean Json objects
+
+Clean your json object from unwanted keys, deeply.
+provide set of `keys` to keep and an indicator for `children` if there is any.
+
+```js
+const cleanObj = (obj, keys = [], childIndicator) => {
+  Object.keys(obj).forEach(key => {
+    if (key === childIndicator) {
+      cleanObj(obj[key], keys, childIndicator)
+    } else if (!keys.includes(key)) {
+      delete obj[key]
+    }
+  })
+}
+/*
+  dirtyObj = { a: 1, b: 2, children: {a: 1, b :2}}
+  let cleaned = cleanObj(dirtyObj, [a]) // { a: 1, children : { a: 1}} 
+ */
+```