More details for readme (#53)

* More details for readme
* README to markdown

Author: dimon222

README.md

@@ -0,0 +1,120 @@
+# hadoop-yarn-api-python-client
+
+Python client for Apache Hadoop® YARN API
+
+[![Latest
+Version](https://img.shields.io/pypi/v/yarn-api-client.svg)](https://pypi.python.org/pypi/yarn-api-client/) [![Travis CI build
+status](https://travis-ci.org/toidi/hadoop-yarn-api-python-client.svg?branch=master)](https://travis-ci.org/toidi/hadoop-yarn-api-python-client) [![Latest documentation
+status](http://readthedocs.org/projects/python-client-for-hadoop-yarn-api/badge/?version=latest)](https://python-client-for-hadoop-yarn-api.readthedocs.org/en/latest/?badge=latest) [![Test
+coverage](https://coveralls.io/repos/toidi/hadoop-yarn-api-python-client/badge.png)](https://coveralls.io/r/toidi/hadoop-yarn-api-python-client)
+
+Package documentation:
+[python-client-for-hadoop-yarn-api.readthedocs.org](http://python-client-for-hadoop-yarn-api.readthedocs.org/en/latest/)
+
+REST API documentation: [hadoop.apache.org](http://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html)
+
+---
+## Compatibility
+Library is compatible with Apache Hadoop __**3.2.1**__.  
+
+If u have version other than mentioned (or vendored variant like Hortonworks), certain APIs might be not working or have differences in
+implementation. If u plan to use certain API long-term, you might want to make sure its not in Alpha stage in documentation.
+
+## Installation
+
+From PyPI
+```
+pip install yarn-api-client
+```
+
+From Anaconda (conda forge)
+```
+conda install -c conda-forge yarn-api-client
+```
+
+From source code
+```
+git clone https://github.com/toidi/hadoop-yarn-api-python-client.git
+pushd hadoop-yarn-api-python-client
+python setup.py install
+popd
+```
+
+## Enabling support for Kerberos/SPNEGO Security
+1. First option - using `requests_kerberos` package  
+
+To avoid deployment issues on a non Kerberized environment, the `requests_kerberos`
+dependency is optional and needs to be explicit installed in order to enable access
+to YARN console protected by Kerberos/SPNEGO.
+
+`pip install requests_kerberos`
+
+From python code
+```
+from yarn_api_client.history_server import HistoryServer
+from requests_kerberos import HTTPKerberosAuth
+history_server = HistoryServer('https://127.0.0.2:5678', auth=HTTPKerberosAuth())
+```
+
+PS: You __**need**__ to get valid kerberos ticket in systemwide kerberos cache before running your code, otherwise calls to kerberized environment won't go through (run kinit before proceeding to run code)
+
+2. Second option - using `gssapi` package  
+
+If you want to avoid using terminal calls, you have to perform SPNEGO handshake to retrieve ticket yourself. Full API documentation: https://pythongssapi.github.iQ/python-gssapi/latest/_
+
+# Usage
+
+### CLI interface
+
+1. First way
+```
+bin/yarn_client --help
+```
+
+2. Alternative way
+```
+python -m yarn_api_client --help
+```
+
+### Programmatic interface
+
+```
+from yarn_api_client import ApplicationMaster, HistoryServer, NodeManager, ResourceManager
+am = ApplicationMaster('https://127.0.0.2:5678')
+app_information = am.application_information('application_id')
+```
+
+### Changelog
+
+0.3.6 Release  
+   - Extend ResourceManager to allow appli
+     determine resource availability prior to submission.
+
+0.3.5 Release  
+   - Hotfix release to fix internal signature mismatch
+
+0.3.4 Release  
+   - More flexible support for discovering Hadoop configuration
+     including multiple Resource Managers when HA is configured
+   - Properly support YARN post response codes
+
+0.3.3 Release  
+   - Properly set Content-Type in PUT requests
+   - Check for HADOOP_CONF_DIR env variable
+
+0.3.2 Release  
+   - Make Kerberos/SPNEGO dependency optional
+
+0.3.1 Release  
+   - Fix cluster_application_kill API
+
+0.3.0 Release  
+   - Add support for YARN endpoints protected by Kerberos/SPNEGO
+   - Moved to `requests` package for REST API invocation
+   - Remove `http_con` property, as connections are now managed by `requests` package
+
+0.2.5 Release  
+  - Fixed History REST API
+
+0.2.4 Release  
+  - Added compatibility with HA enabled Resource Manager

README.rst

@@ -23,7 +23,7 @@ def find_version(*file_paths):
     name = 'yarn-api-client',
     version = find_version('yarn_api_client', '__init__.py'),
     description='Python client for Hadoop® YARN API',
-    long_description=read('README.rst'),
+    long_description=read('README.md'),
     packages = find_packages(exclude=['tests','itests']),
 
     install_requires = [