[TASK] Add basic documentation
[TASK] Add basic documentation

qudos-com/elasticsearch-river-jdbc,msimons/elasticsearch-jdbc,msimons/elasticsearch-jdbc,msimons/elasticsearch-river-jdbc,qudos-com/elasticsearch-river-jdbc,msimons/elasticsearch-jdbc,jprante/elasticsearch-jdbc,jprante/elasticsearch-jdbc,qudos-com/elasticsearch-river-jdbc,jprante/elasticsearch-jdbc,msimons/elasticsearch-river-jdbc,msimons/elasticsearch-river-jdbc