Update README

Convert README from rst to markdown format.
Add sub-package for helpers.

Change-Id: Ie27357c8ee2b4b243a0b71e1ec5547d6448e77a6

README.md

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+# Stacklight tests
+
+
+This project based on two other projects:
+
+  * Devops: [Devops documentation](http://docs.fuel-infra.org/fuel-dev/devops.html)
+
+  * Fuel-QA: [Fuel-QA documentation](https://docs.fuel-infra.org/fuel-qa/)
+
+
+## Step-by-step guide:
+
+
+1. Prepare the environment:
+
+  * `vi openrc`
+
+  * `. openrc`
+
+  * `./utils/fuel-qa-builder/prepare_env.sh`
+
+
+2. Run the tests:
+
+  `./utils/jenkins/system_tests.sh -k -K -j fuelweb_test -t test -w $(pwd) -o --group=<your_test_group_to_run>`
+
+  You can read more about on https://docs.fuel-infra.org/fuel-qa/ or
+  run it next way to view help: `./utils/jenkins/system_tests.sh -h`.
+
+
+
+## To contributors:
+
+Please, follow next rules:
+
+* run `tox` or `tox -epep8` before send to review
+
+* try to reuse in dependencies previous deployed environment in
+`@test(depends_on=[<dependency>]`
+(usually basic env is deployed in smoke bvt tests)
+
+* mark test group following next pattern:
+
+ ```
+ @test(groups=["<full_unique_name_of_test>",
+               "<test_method_purpose>",
+               "<plugin_name>",
+               "<test_category>"])
+ ```
+
+ For example:
+
+ ```
+ @test(groups=["install_influxdb_grafana",
+               "install",
+               "influxdb_grafana",
+               "smoke"])
+ ```

README.rst

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-Stacklight tests
-----------------
-
-Project based on two other projects:
-  * Devops
-  * Fuel-QA
-
-  [Devops documentation](http://docs.fuel-infra.org/fuel-dev/devops.html)
-  [Fuel-QA documentation](https://docs.fuel-infra.org/fuel-qa/)
-
-
-Step-by-step guide:
--------------------
-
-#. Prepare env:
-  * vi openrc
-  * . openrc
-  * ./utils/fuel-qa-builder/prepare_env.sh
-
-#. Run tests:
-  Use fuel-qa technique, you can read more about it on https://docs.fuel-infra.org/fuel-qa/
-  Basic method to run for developers is:
-  ./utils/jenkins/system_tests.sh -k -K -j fuelweb_test -t test -w $(pwd) -o --group=<your_test_group_to_run>