Add Student Metadata

Create a `{SID}.yaml` in the `attendence` folder. with the following contents

```yaml
name: Your Name Here
sid: Your SID
branch: Your Branch
feedback: Some Feed back for us :)
```

example:
```yaml 23107105.yaml
name: Harmanjeet Singh Sahota
sid: 23107105
branch: Mechanical Engg.
feedback: git gud >:(
```