How to add a Matcher Plugin in CiviBanking as I get "No Matcher Plugin Found"?
A matcher is added just like an importer on the configuration screen. The configuration screen has different sections. The top one is the importer, then the matchers, then post processors and the last one are exporter plugins. 

See below for a screenshot:



After you click on Add a matcher you are able to select a matcher type and a configuration for that matcher type.