[qa] Split README.md to /qa and /qa/rpc-tests

+ Update with new -help message

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+Notes
+=====
+
+You can run any single test by calling `qa/pull-tester/rpc-tests.py <testname>`.
+
+Or you can run any combination of tests by calling `qa/pull-tester/rpc-tests.py <testname1> <testname2> <testname3> ...`
+
+Run the regression test suite with `qa/pull-tester/rpc-tests.py`
+
+Run all possible tests with `qa/pull-tester/rpc-tests.py -extended`
+
+Possible options:
+
+```
+  -h, --help            show this help message and exit
+  --nocleanup           Leave bitcoinds and test.* datadir on exit or error
+  --noshutdown          Don't stop bitcoinds after the test execution
+  --srcdir=SRCDIR       Source directory containing bitcoind/bitcoin-cli
+                        (default: ../../src)
+  --tmpdir=TMPDIR       Root directory for datadirs
+  --tracerpc            Print out all RPC calls as they are made
+  --coveragedir=COVERAGEDIR
+                        Write tested RPC commands into this directory
+```
+
+If you set the environment variable `PYTHON_DEBUG=1` you will get some debug output (example: `PYTHON_DEBUG=1 qa/pull-tester/rpc-tests.py wallet`). 
+
+A 200-block -regtest blockchain and wallets for four nodes
+is created the first time a regression test is run and
+is stored in the cache/ directory. Each node has 25 mature
+blocks (25*50=1250 BTC) in its wallet.
+
+After the first run, the cache/ blockchain and wallets are
+copied into a temporary directory and used as the initial
+test state.
+
+If you get into a bad state, you should be able
+to recover with:
+
+```bash
+rm -rf cache
+killall bitcoind
+```
+
+Further information about the test framework and individual rpc
+tests is found in [qa/rpc-tests/README.md](/qa/rpc-tests/README.md).