Merge pull request Qiskit#8 from jaygambetta/readme

Updating the readme with stackoverflow and removing some white spaces

README.md

@@ -1,6 +1,6 @@
 # Qiskit Aer
 
-[![PyPI](https://img.shields.io/pypi/v/qiskit.svg)](https://pypi.python.org/pypi/qiskit-aer)
+[![License](https://img.shields.io/github/license/Qiskit/qiskit-aer.svg?style=popout-square)](https://opensource.org/licenses/Apache-2.0)[![Build Status](https://img.shields.io/travis/com/Qiskit/qiskit-aer/master.svg?style=popout-square)](https://travis-ci.com/Qiskit/qiskit-aer)![](https://img.shields.io/pypi/v/qiskit-aer.svg?style=popout-square)![](https://img.shields.io/pypi/dm/qiskit-aer.svg?style=popout-square)
 
 **Qiskit** is an open-source framework for working with noisy intermediate-scale quantum computers (NISQ) at the level of pulses, circuits, and algorithms.
 
@@ -15,10 +15,8 @@ pip install qiskit
 ```
 
 PIP will handle all dependencies automatically for us and you will always install the latest (and well-tested) version.
-
-To install from source, follow the instructions in the [contribution guidelines](.github/CONTRIBUTING.rst).
-
 
+To install from source, follow the instructions in the [contribution guidelines](.github/CONTRIBUTING.rst).
 
 ## Simulating your first quantum program with Qiskit Aer
 Now that you have Qiskit Aer installed, you can start simulating quantum circuits with noise. Here is a basic example:
@@ -66,22 +64,19 @@ print(sim_result.get_counts(qc))
 {'11': 412, '00': 379, '10': 117, '01': 116}
 ```
 
-
 ## Contribution guidelines
 
 If you'd like to contribute to Qiskit Aer, please take a look at our
 [contribution guidelines](.github/CONTRIBUTING.rst). This project adheres to Qiskit's [code of conduct](.github/CODE_OF_CONDUCT.rst). By participating, you are expect to uphold this code.
 
-We use [GitHub issues](https://github.com/Qiskit/qiskit-aer/issues) for tracking requests and bugs. 
-Please use our [slack](https://qiskit.slack.com) for discussion. To join our Slack community use the [link](https://join.slack.com/t/qiskit/shared_invite/enQtNDc2NjUzMjE4Mzc0LTMwZmE0YTM4ZThiNGJmODkzN2Y2NTNlMDIwYWNjYzA2ZmM1YTRlZGQ3OGM0NjcwMjZkZGE0MTA4MGQ1ZTVmYzk).
-
+We use [GitHub issues](https://github.com/Qiskit/qiskit-aer/issues) for tracking requests and bugs.
+Please use our [slack](https://qiskit.slack.com) for discussion and simple questions. To join our Slack community use the [link](https://join.slack.com/t/qiskit/shared_invite/enQtNDc2NjUzMjE4Mzc0LTMwZmE0YTM4ZThiNGJmODkzN2Y2NTNlMDIwYWNjYzA2ZmM1YTRlZGQ3OGM0NjcwMjZkZGE0MTA4MGQ1ZTVmYzk). For questions that are more suited for a forum we use the Qiskit tag in the [Stack Overflow](https://stackoverflow.com/questions/tagged/qiskit).
 
 ### Next Steps
 
 Now you're set up and ready to check out some of the other examples from our
 [Qiskit Tutorials](https://github.com/Qiskit/qiskit-tutorials/tree/master/qiskit/aer) repository.
 
-
 ## Authors
 
 Qiskit Aer is the work of [many people](https://github.com/Qiskit/qiskit-aer/graphs/contributors) who contribute