Fast IP Calculator

- Fast and lightweight IP subnet calculator- Calculates the network, broadcast, first usable, and last usable IPs on the fly based on user input- Uses a subnetting library I wrote in Kotlin for fun- Allows the user to select from a list of themes, which I added as an educational exercise for myself while I learn Android development- Basically a toy app, but it may be handy for someone learning subnetting or studying for network certifications