Added some info about python blocks.
diff --git a/python/receiver/README b/python/receiver/README
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+chirpz.py - implementation of chirpz transform
+clock_offset_control.py - block implementing simple algorithm for clock offset control
+gsm_input.py - adapts signal to the input of the gsm receiver, executes clock offset correction
+fcch_detector.py - (experimental componen for a new gsm receiver) detects fcch bursts
+fcch_burst_tagger.py - (experimental componen for a new gsm receiver) part of fcch_detector - add fcch tag when FCCH burst is found
+sch_detector.py - (experimental componen for a new gsm receiver) unfinished block that detects exact position of a SCH burst based on fcch tags, should probably also read content of SCH bursts
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