Adding contributor into README.
Proofread and edited chapter 1. Also fixed some typos.
Updated terms in README.md
Chapter 5 80% translated. Jokes are not translated yet.
Finished translating chapter 5. Jokes are left untranslated for now.
Merged latest upstream with Indonesian chapter 5 translation.
Merge pull request #29 from addianto/master

[ID] Chapter 5 translation