more details added

tests/README

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-Describe the test stuff
+The cURL Test Suite
 
 Requires:
   perl, sh
 
 Run:
-  (should be) 'make test'
+  'make test'. This invokes the 'runtests.sh' shell script. Edit the top
+  variables of that script in case you have some specific needs.
 
 Logs:
   All logs are generated in the logs/ subdirctory (it is emtpied first
   in the runtests.sh script)
 
 Data:
-  All test-data are put in the data/ subdirctory. Further descriptions on
-  the data format must be added here.
+  All test-data are put in the data/ subdirctory.
+
+  For each tests there exist four files. Replace N with the test number:
+
+    nameN.txt: test description as displayed when run
+
+    commandN.txt: command line options for this test
+
+    httpN.txt: the full dump of the HTTP protocol communication that curl is
+               expected to use when performing this test
+
+    replyN.txt: the full dump the server should reply to curl for this test