Update README.md

Added:
-Topic 'Imagery'
-Topic 'Search'
-Imagery > ZXing
-Imagery > Picasso
-Search > Solr
-Search > Elasticsearch
-Database > JDBI
-Development > RxJava
-Development > vert.x
-Distributed Applications > Apache Storm
-Machine Learning > h2o

Changed:
-Description 'Development'