Add: initial pattern document architecture decisions (#773)

Add: initial pattern - Document Architecture Decisions

Author: rossbachp

README.md

@@ -92,6 +92,7 @@ Our mission
 * [InnerSource Ambassadors](/patterns/1-initial/innersource-ambassador.md) - *When driving InnerSource adoption through a large, decentralized organization it is hard to understand and address the local challenges that come up in different departments and regions. Local volunteers, called InnerSource Ambassadors, provide localized support by promoting InnerSource principles and acting as a communication bridge between their teams and the ISPO.*
 * [Circle Communities](/patterns/1-initial/circle-communities.md) - *InnerSource adoption is slow in organizations due to limited understanding, engagement, and contextual relevance. Circle Communities address this by fostering synchronous conversations that build connections, close knowledge gaps, and cultivate collaboration and continuous learning.*
 * [Internal Developer Platform](/patterns/1-initial/internal-developer-platform.md) - *As InnerSource adoption increases throughout an organisation, it is not unusual that project teams start to face inefficiencies in scaling their efforts due to fragmented tooling, environments, and workflows. An Internal Developer Platform (IDP) provides a way to tackle this type of challenges through a centralized, self-service system that standardizes development environments and integrates tools to enhance consistency, collaboration, and developer productivity.*
+* [Document Architecture Decisions](/patterns/1-initial/document-architecture-decisions.md) - *InnerSource contributors often face challenges in grasping the system's design rationale, which can result in misalignment between maintainers, contributors, and stakeholders — potentially discouraging participation. To enhance decision-making and transparency, we recommend capturing architecture decisions and their consequences in a lightweight, accessible format to streamline onboarding, clarify decisions, and support long-term project sustainability.*
 
 <!--
 NOTE: The 'Initial' Patterns below don't have a Patlet yet, which is essential for readers to quickly browse our patterns.