Readme fixes

[sagron]

./gradlew :quasar-codeswap-main:jar
should be
./gradlew :quasar-codeswap-module:jar
in the README.md

also for windows instructions:
gradlew.bat :quasar-codeswap-main:build
gradlew.bat :quasar-codeswap-module:jar

[sagron]

Also Quasar is spelled as Qusar in the header

[pron]

Thank you!