Adding new page to make it easier to find the mindmap (#340)

Adding new page in the book to make it easier to find the mindmap. New page shall be available at https://patterns.innersourcecommons.org/explore-patterns

Author: spier

book/explore-patterns.md

@@ -0,0 +1,19 @@
+# Explore Patterns
+
+More and more patterns are contributed to this book by the InnerSource Commons community. That is awesome!
+
+Now how to make it easy for readers to discover the patterns that can help them in their particular situation?
+
+For this purpose we provide this mind map. It **categorizes patterns based on the different phases of an InnerSource Program**, and the challenges that might appear in the respective phases.
+
+<img src="./innersource-program-mind-map.png" title="InnerSource Patterns as a Mind Map">
+
+## Improve this Mind Map
+
+If you notice anything in this mind map that looks wrong, please [open an issue](https://github.com/InnerSourceCommons/InnerSourcePatterns/issues), describing the problem and the fix that should be made.
+
+Further if you have other ideas for improving the discoverability of these patterns, or want to make this mind map better, review the documentation of our [Pattern Categorization](https://github.com/InnerSourceCommons/InnerSourcePatterns/blob/main/pattern-categorization/README.md) approach, and also check how to [contribute to this book](contribute.md).
+
+## References
+
+The idea for categorizing patterns like this is loosely based a description in [Thoughts on an InnerSource Pattern Language](https://drive.google.com/file/d/13AY8glCOdpLOVuz7cVD6QOB8d2xbHCS1/view) by Tim Yao, Bob Hanmer and Padma Sudarsan (2018). For specifics see slide 15 in that slide deck.

book/toc_template.md

@@ -11,6 +11,7 @@ Instead edit toc_template.md
 # Table of Contents
 
 * [Table of Contents](../book/toc.md)
+* [Explore Patterns[](../book/explore-patterns.md)
 * [Contribute to this book](../book/contribute.md)
 
 <img src="./innersource-program-mind-map.png" title="InnerSource Patterns as a Mind Map">