Hi Venkat,

Follow these Steps to add lightning components to tab -
1- Create a custom tab for component.

    From Setup, enter Tabs in the Quick Find box, then select Tabs.
    Click New in the Lightning Component Tabs related list.
    Select the Lightning component that you want to make available to users.
    Enter a label to display on the tab.
    Select the tab style and click Next.
    When prompted to add the tab to profiles, accept the default and click Save.

2 - Add your Lightning components to the App Launcher.

    From Setup, enter Apps in the Quick Find box, then select Apps.
    Click New. Select Custom app and then click Next.
    Enter Lightning for App Labeland click Next.
    In the Available Tabs dropdown menu, select the Lightning Component tab you created 
    and click the right arrow button to add it to the custom app.

3 - Check your output by navigating to the App Launcher in Lightning Experience. Your custom app should appear 
    in theApp Launcher. Click the custom app to see the components you added.    
    
    https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/aura_add_cmp_lex.htm
    
    if you found this answer helpful then please mark it as best answer so it can help others.
    
    Thanks,
    Ajay Dubedi