Add the date joined attribute to the exec object.

[Rikveet]

Benefit

• Better Visual representation.
• Previous years teams can be sorted by year.
• People who have worked together can be grouped.
• Overall better organization.

Purposed steps

• [ ] Update the teams component to include the date attribute
• [ ] Add a 'middleware' to add exec method of the exec service. Which will add the date: Date.now() and store the current time in milliseconds. Hence requiring no UI change. This is a valid solution because the exec will the added to the site around the time they join.
• [ ] Update the firebase firestore rules if there are any attribute checks.
• [ ] Update the currently stored info on firebase manually.
• [ ] Update the teams display page to show the data.