Doc change: add third party elixir drivers for cassandra
Doc change: add third party elixir drivers for cassandra

Closes #143

Patch by Samar Dhwoj Acharya; Reviewed by Jeff Jirsa for CASSANDRA-13824

adelapena/cassandra,thelastpickle/cassandra,tjake/cassandra,szhou1234/cassandra,WorksApplications/cassandra,instaclustr/cassandra,jrwest/cassandra,blambov/cassandra,beobal/cassandra,mshuler/cassandra,exoscale/cassandra,szhou1234/cassandra,snazy/cassandra,clohfink/cassandra,beobal/cassandra,yukim/cassandra,driftx/cassandra,aboudreault/cassandra,jasonstack/cassandra,mkjellman/cassandra,krummas/cassandra,belliottsmith/cassandra,mike-tr-adamson/cassandra,aureagle/cassandra,krummas/cassandra,cooldoger/cassandra,jbellis/cassandra,pauloricardomg/cassandra,kgreav/cassandra,belliottsmith/cassandra,mkjellman/cassandra,instaclustr/cassandra,thelastpickle/cassandra,spodkowinski/cassandra,snazy/cassandra,michaelsembwever/cassandra,michaelsembwever/cassandra,krummas/cassandra,mike-tr-adamson/cassandra,adelapena/cassandra,kgreav/cassandra,blambov/cassandra,bdeggleston/cassandra,bcoverston/cassandra,jeromatron/cassandra,beobal/cassandra,ifesdjeen/cassandra,kgreav/cassandra,aweisberg/cassandra,juiceblender/cassandra,tommystendahl/cassandra,WorksApplications/cassandra,josh-mckenzie/cassandra,ifesdjeen/cassandra,blerer/cassandra,yukim/cassandra,blerer/cassandra,jasobrown/cassandra,tjake/cassandra,jasobrown/cassandra,ptnapoleon/cassandra,driftx/cassandra,szhou1234/cassandra,jeromatron/cassandra,mshuler/cassandra,jeromatron/cassandra,bdeggleston/cassandra,thelastpickle/cassandra,mkjellman/cassandra,stef1927/cassandra,krummas/cassandra,driftx/cassandra,aweisberg/cassandra,cooldoger/cassandra,beobal/cassandra,pauloricardomg/cassandra,spodkowinski/cassandra,jrwest/cassandra,yukim/cassandra,chbatey/cassandra-1,snazy/cassandra,driftx/cassandra,christian-esken/cassandra,bcoverston/cassandra,aboudreault/cassandra,aureagle/cassandra,Instagram/cassandra,mshuler/cassandra,WorksApplications/cassandra,blambov/cassandra,blerer/cassandra,aweisberg/cassandra,DikangGu/cassandra,iamaleksey/cassandra,ptnapoleon/cassandra,kgreav/cassandra,stef1927/cassandra,DikangGu/cassandra,cooldoger/cassandra,bcoverston/cassandra,instaclustr/cassandra,clohfink/cassandra,belliottsmith/cassandra,christian-esken/cassandra,mkjellman/cassandra,cooldoger/cassandra,ollie314/cassandra,ifesdjeen/cassandra,aureagle/cassandra,ptnapoleon/cassandra,juiceblender/cassandra,tommystendahl/cassandra,Instagram/cassandra,belliottsmith/cassandra,clohfink/cassandra,pauloricardomg/cassandra,snazy/cassandra,stef1927/cassandra,adelapena/cassandra,jeffjirsa/cassandra,jeffjirsa/cassandra,ollie314/cassandra,mike-tr-adamson/cassandra,Instagram/cassandra,adejanovski/cassandra,DikangGu/cassandra,adelapena/cassandra,Instagram/cassandra,mike-tr-adamson/cassandra,WorksApplications/cassandra,spodkowinski/cassandra,yukim/cassandra,aboudreault/cassandra,josh-mckenzie/cassandra,apache/cassandra,spodkowinski/cassandra,stef1927/cassandra,josh-mckenzie/cassandra,michaelsembwever/cassandra,blerer/cassandra,jasonstack/cassandra,mshuler/cassandra,ifesdjeen/cassandra,thelastpickle/cassandra,jbellis/cassandra,szhou1234/cassandra,apache/cassandra,exoscale/cassandra,iamaleksey/cassandra,jrwest/cassandra,juiceblender/cassandra,tjake/cassandra,michaelsembwever/cassandra,adejanovski/cassandra,jbellis/cassandra,pauloricardomg/cassandra,tjake/cassandra,adejanovski/cassandra,clohfink/cassandra,chbatey/cassandra-1,christian-esken/cassandra,tommystendahl/cassandra,juiceblender/cassandra,jrwest/cassandra,bdeggleston/cassandra,ollie314/cassandra,instaclustr/cassandra,jasobrown/cassandra,blambov/cassandra,jasobrown/cassandra,josh-mckenzie/cassandra,iamaleksey/cassandra,aweisberg/cassandra,jeffjirsa/cassandra,jasonstack/cassandra,tommystendahl/cassandra,exoscale/cassandra,apache/cassandra,jeffjirsa/cassandra,iamaleksey/cassandra,chbatey/cassandra-1,bcoverston/cassandra,apache/cassandra,bdeggleston/cassandra