added Oskar lighting talk
Merge pull request #20 from aokon/light_talk

added Oskar lighting talk
#24 trug
#24 trug talk
Merge pull request #21 from wafcio/24_meetup

#24 trug talk
#25 trug
#25 - 1st topic
added videos for TRUG#22
Merge pull request #22 from aokon/trug_#22

added videos for TRUG#22
#26 TRUG
#27 TRUG