added some description of repository contents
updated README.md
Merge pull request #1 from Mango-information-systems/documentation

Documentation
tech topics graph visualisation
Merge branch 'master' of github.com:BrusselsDataScienceCommunity/SNA
updates on d3 graph visualization:
* added legend to explain the colors
* added title to show currently displayed dataset
* display the 'graph to load' select above the graph instead of the bottom the page
* switched to basic two-columns layout
Merge pull request #2 from Mango-information-systems/d3

updates on d3 graph visualization:
cleaned up tech d3 graph visualization
updated network graphs and calculated connectedness
resolved merge conflicts
updated connectedness definition and fixed index.html
changed find_new_members.py back to original calculation because new one was giving worse results
updated new_members.csv
metrics from meetup graph walking
Merge branch 'master' of github.com:BrusselsDataScienceCommunity/SNA
added activity and interests metric
Updated graph walk algo + Reuploaded d3 legend code
update graph_walk using sliced_graph class
Documenting the meetup/ folder
added twitter influencers analysis