validation in text fields

[vaibhavchellani]

queue is getting created even when the fields are blank , dont let user create queue with blank inputs , show a snackbar promting user to fill all the fields

[vaibhavchellani]

@IshaAgarwal98 get on this , make branches and work

[kunwar97]

I have created pull request regarding this issue
#26

[vaibhavchellani]

@kunwar97 please get approval before working on the issue, i will review and accept this PR as no one has started work on it yet but i wont be able to do so next time . Feel free to create issues and work on them after getting approval .

[kunwar97]

Thank You