moving Ethics to lesson 3

1-Introduction/3-ethics/README.md

1-Introduction/3-ethics/assignment.md

1-Introduction/3-ethics/translations/README.es.md

1-Introduction/README.md

8-Real-World/1-Applications/README.md

8-Real-World/1-Applications/assignment.md

8-Real-World/1-Applications/translations/README.es.md

8-Real-World/README.md

README.md