Added instructions: contains preface for "userbashrc"

install.sh: now creates the file userbashrc in the modules section
    moves the existing .bashrc to ~/.config/terrorshell/modules/userbashrc so that all pre existing
    aliases will persist
templates/bashrc: added userbashrc to the list of modules
TODO Learn how commit messages work, and proper practice for push's
TODO check existing bashrc for conflicting alias names
I'm replacing these in the experimental branch soon. These will be using /sys/class/power_supply/bat*/ information instead.