[#CSM-25] Define search syntaxes

https://issues.openmrs.org/browse/CSM-25 | handled  'Blood Pressure' to search for Blood, Blood*, Blood~, Pressure etc,  added use of OR in search phrase, made 36 include 36.*,  among others
Left with;
1. should we have " " indicate that the search entry should search as a phrase (as with google)?
2. Should there be a way to preselect filters using the search box? For example obs:blood would only search observations for blood?