Updated readme.

README.md

-Contains tests for API. All API tests are currently grouped for these served by hived
- and these served by hivemind. The goal is to have flat list of the tests and start
- their subsets separatly by hived and hivemind CI processes.
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+* Abstract: * This repository contains tests for API. All API tests are currently 
+  grouped for these served by hived  and these served by hivemind. The goal is to 
+  have flat list of the tests and start their subsets separatly by hived and 
+  hivemind CI processes.
+
+= Usage:
+== Usage with `hived`:
+=== Python API tests:
+Runnable with `ctest` (TODO)
+=== PyRest API tests:
+Node address is defined inside bash script.
+a) API tests with `equal` comparator (using strict equal on query result and pattern):
+`./run_api_tests.sh equal`
+
+b) API tests with `contain` comparator (check if result contain pattern):
+`./run_api_tests.sh contain`
+
+== Usage with `hivemind`:
+=== Python API tests:
+Runnable with `ctest` (TODO)
+
+=== PyRest API tests:
+In tests directory we have two bash scripts `run_api_tests.sh` and `run_api_benchmarks.sh`. 
+Examples of running scripts:
+a) API tests with `equal` comparator (using strict equal on query result and pattern):
+`./run_api_tests.sh https://api.hive.blog equal`
+
+b) API tests with `contain` comparator (check if result contain pattern):
+`./run_api_tests.sh https://api.hive.blog contain`
+
+c) Benchmarks:
+`./run_api_benchmarks.sh https://api.hive.blog`
+