Qiskit open-source index page (#1725)

Initial draft for index page in `/open-source`

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Co-authored-by: abbycross <[email protected]>
Co-authored-by: Eric Arellano <[email protected]>

Author: 3 people

docs/open-source/index.mdx

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 title: Open source
-description: TODO - filler text so that the SEO check doesn't complain!
+description: Learn how to get involved with the Qiskit open-source community to shape the future of quantum computing.
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 # Open source
 
-Blah blah
+Since 2016, IBM Quantum™ has harnessed the power of community-driven innovation by making quantum computing resources accessible to everyone via the cloud.
+This groundbreaking initiative includes open-sourcing key parts of the quantum software stack and introducing Qiskit, a versatile quantum computing framework.
+Today, Qiskit is the most popular quantum framework, thanks in part to its vibrant community.
+The Qiskit community is a dynamic and welcoming group of developers, scientists, and enthusiasts collaborating to advance software, research, education, and business through quantum computing.
+By making this transformative technology open and accessible, we accelerate innovation and discover new applications.
+
+As quantum technology evolves, contributions from the open-source [Qiskit ecosystem](https://www.ibm.com/quantum/ecosystem) projects and developers are crucial in shaping its future.
+
+By joining the Qiskit community, you can participate in the development of quantum technologies.
+Whether you are a seasoned quantum programmer or beginning your quantum journey, Qiskit provides the support and inspiration needed to push boundaries.
+We welcome all kinds of contributions, from code in pull requests to community support on [Slack](/support#qiskit), ensuring everyone can play a role in advancing quantum technology.