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
Why not make this entire portion part of the userbashrc (as a multiline comment). Then there is no need for the instructions file. Since this loads when modules load it uses all the users aliases / functions instead of terrorshells which I believe is the desired functionality correct?