Add new list of written learning resources to the docs

docs/source/knowledgebase/causal_written_resources.md

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+# Causal written resources
+
+## Awesome Causal Inference
+
+A fantastic one-stop shop for resources on a range of causal topics can be found in *Matt Courthoud* [Awesome Causal Inference](https://github.com/matteocourthoud/awesome-causal-inference) GitHub repo.
+
+Covering the essentials from:
+
+- Academia
+- Industry
+- Books
+- Blogs
+- Code implementations
+- Talks
+- Tutorials
+
+## CausalPy focused written resources
+
+The CausalPy package is designed to allow analysts to easily analyse quasi-experiments. As such, key resources include:
+
+- Charles Reichardts - Quasi-Experimentation: A Guide to Design and Analysis.

docs/source/knowledgebase/index.md

@@ -7,5 +7,5 @@ glossary
 design_notation
 quasi_dags.ipynb
 causal_video_resources
-
+causal_written_resources
 :::