Add Text field Validation

[InfiniteCoder06]

Resolves #6

[karasevm]

Generally not a big deal but I don't like how this implementation is more restrictive than the system settings one (source code). I feel at the very least IDN's like яндекс.рф and 互联网中心.中国 should be accepted. As an alternative maybe just fail the validation if any special character are matched?

[InfiniteCoder06]

Generally not a big deal but I don't like how this implementation is more restrictive than the system settings one (source code). I feel at the very least IDN's like яндекс.рф and 互联网中心.中国 should be accepted

Adding the package of Google guava Library to get the same implementation

Adding this library doesnt affect the output size since R8 is enabled

[karasevm]

LGTM