[Sprint #6] User Account Page & its test code

---- NOTE ----
1. User Account Page Feature is added
2. User Account View code is added
3. urls & simple template page for account is added
4. Test code for AccountView is added
- why this `get_object` is needed?
- in this case, we find user twice ( duplication on implemenation )
- so how about to change like this : 
```
def get_object(self, queryset = None)
    return self.request.user
```
- or you can just remove this function ( `get_object` ) and change this View to inherit `TemplateView`