Radio Newsbriefs:   WNYC (820 AM) is adding the syndicated NPR program, "Tell Me More with Michel Martin", to its weekday schedule, beginning Monday, June 30th. The show, which features news, interviews, and commentary, airs Monday to Friday 2-3 PM.    Hot 97 (WQHT) has announced a new morning show line-up, effective July 21st, to replace Miss Jones, who exits during the week of June 30th. The new schedule will consist of an early morning show (5-7 AM) featuring Cipha Sounds and Peter Rosenberg, and a mid-morning show (7-10 AM) featuring the syndicaed Big Boy`s Neighborhood.    Emmis has named Leslie Fram, long-time WNNX (Atlanta) programmer, as the new Program Director for rock station WRXP (101.9). She replaces Blake Lawrence, a holdover from the station`s smooth jazz format.    After a false start last year, Arbitron will start releasing official Portable People Meter (PPM) radio ratings for New York beginning with the September ratings. Arbitron opted to keep using the diary method last November after questions arose about the accuracy of PPM data.