Function addObject

addObject(filePath, id, content): Promise<void>
Adds an object to a JSON file.
Parameters
- filePath: string
  
  The path to the JSON file.
- id: any
- content: object
  The object to be added to the JSON file.
  - The addObject function adds an object to a JSON file by first checking if the file exists.
  - If the file does not exist, an error message is displayed. If the file exists, the function reads the existing data from the file,
  - appends the new object to the data, and then writes the updated data back to the file.
Returns Promise<void>
Example
```
const filePath = "data.json";
 const id = 1;
 const content = { name: "John", age: 30 };
 addObject(filePath, id, content);
```
- Defined in index.ts:228

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