Adding new language keyboard layout in KDE

1) Open "System Settings" from the KDE menu.
2) Click on the "Regional and Language" option.
3) Click on the "Keyboard Layout"
4) Click on the radio button "Enable keyboard layout"
5) Select your country name "Layout Name" that is given in the list which you can find it below. for me it is Nepal country code "np" and shift it to the Active layout by clicking the right arrow button.
6) save and then start using, also tick on the "show indicator for single layout" in the "Indicator Option" tab for easy changing option.