Add bridge blocking script to README

.gitignore

 .idea
+__pycache__
 countries.json
 countries-bridges.csv
\ No newline at end of file

README.md

@@ -38,6 +38,15 @@ When older reports are available, these will be ignored.
 
     countries-that-block-tor.py --since=2017-12-24 ooni-sync/data/vanilla_tor/
 
+## Find countries that might block Tor bridges
+
+Download OONI reports for `tcp_connect` instead of `vanilla_tor`.
+Use ooni-sync as explained above.
+
+Then run the following command to get a CSV file that helps with the analysis.
+
+    countries-that-block-bridges.py ooni-sync/data/tcp_connect/
+
 # Limitations
 
 Please note that the output of the scripts might give false negatives,