Add Function to check if string is valid JSON (#1168)

* Create readme.md

* Create checkStringisValidJson.js

* Added isValidJSON function to verify if the string is valid JSON and log the result

* Create README file with title, description, usage, and examples for isValidJSON function.

Author: naveenraw25

Background Scripts/Check String is Valid JSON/checkStringisValidJson.js

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+// Function to check if a string is a valid JSON
+function isValidJSON(str) {
+    try {
+        // Try to parse the string as JSON
+        JSON.parse(str);
+    } catch (e) {
+        // If an error occurs, the string is not valid JSON
+        return false;
+    }
+    // If no error occurs, the string is valid JSON
+    return true;                    
+}
+
+// Example JSON string
+const str = '{ "firstName":"John" , "lastName": "Doe"}'; 
+
+// Check if the string is valid JSON and log the result
+if (isValidJSON(str)) {
+  console.log('String is valid JSON');
+} else {
+  console.log('String is not valid JSON');
+}

Background Scripts/Check String is Valid JSON/readme.md

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+# Function to check if string is a valid JSON
+
+## Problem statement
+When working with serialized data, you might come across some malformed or invalid JSON strings from time to time. While JavaScript doesn't have a built-in validation method for JSON, it has a handy JSON.parse() method that can be used to check if a string is a valid JSON format.
+
+## Description
+The `isValidJSON` function checks if a given string is a valid JSON format. It tries to parse the string and returns `true` if the parsing is successful and `false` if an error occurs during the parsing process. 
+
+## Usage
+This function is useful for validating JSON strings before attempting to use them in your application. 
+
+## Examples
+
+### Example 1
+```javascript
+const str = '{ "firstName": "John", "lastName": "Doe" }';
+```
+This will output: `String is valid JSON`
+
+### Example 2
+```javascript
+const invalidStr = '{ firstName: John, lastName: Doe }';
+```
+This will output: `String is not valid JSON`