Add readme file

Author: tkachoff

README.md

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+#ReportPortal python client 
+
+[![PyPI](https://img.shields.io/pypi/v/reportportal-client.svg?maxAge=2592000)](https://pypi.python.org/pypi/reportportal-client)
+
+Library used only for implementors of custom listeners for ReportPortal
+
+## Allready implemented listeners:
+* Robot Framework (link)
+
+
+## Installation
+
+The latest stable version is available on PyPI:
+
+    pip install reportportal-client
+
+
+## Usage
+
+Main classes are:
+
+- reportportal_client.ReportPortalService
+- reportportal_client.StartLaunchRQ
+- reportportal_client.StartTestItemRQ
+- reportportal_client.FinishTestItemRQ
+- reportportal_client.FinishExecutionRQ
+- reportportal_client.SaveLogRQ
+
+Basic usage example:
+
+```python
+from time import time
+from reportportal_client import (ReportPortalService, 
+                                 FinishExecutionRQ,
+                                 StartLaunchRQ, StartTestItemRQ,
+                                 FinishTestItemRQ, SaveLogRQ)
+
+def timestamp():
+    return str(int(time() * 1000))
+
+endpoint = "https://urlpreportportal"
+project = "ProjectName"
+token = "uuid" #you can get it from profile page in ReportPortal
+launch_name = "name for launch"
+launch_doc = "Some text documentation for launch"
+
+service = ReportPortalService(endpoint=endpoint,
+                              project=project,
+                              token=uuid)
+
+#Start Launch
+sl_rq = StartLaunchRQ(name=launch_name,
+                      start_time=timestamp(),
+                      description=launch_doc)                  
+r = service.start_launch(sl_rq)
+launch_id = r.id
+
+#Finish Launch
+fl_rq = FinishExecutionRQ(end_time=timestamp(),
+                          status="PASSED")
+service.finish_launch(launch_id, fl_rq)
+```
+
+# Copyright Notice
+Licensed under the [GPLv3](https://www.gnu.org/licenses/quick-guide-gplv3.html)
+license (see the LICENSE file).