chap2 updated.

added co-supervisor.
package.json  updated
report: sota -> tuneglue done
intro updated. chap2 updated
chapter 1 and 2 updated: translation done
chap3 to be translated
chap3 translation update
includeonly added
chap3 update
repeated list item
chap3: translation updated
chap3: translation update
chap3: intro updated
chap3: introducing spotify updated
chap3: translation done until 3.1.1.1
chap3: translation updated: 3.1.1.2 done
chap3: translation update -> 3.1.1 done
chap3: translation done
Merge branch 'report-translation' into report
typo in chap3 corrected. chap4 intro added
chap4: updated.

algorithm explanation started