Add SDMX analysis notebooks

Author: rohitkumarbhagat

notebooks/README.md

@@ -1,3 +1,14 @@
 # Python API Notebooks
 
-This directory contains Colab notebooks that use the Python API. 
+This directory contains Colab notebooks that use the Data Commons Python client
+and SDMX APIs.
+
+## SDMX notebooks
+
+These notebooks use SDMX to retrieve statistical observations and the Data Commons
+Python client to retrieve place names. Each notebook installs its dependencies
+and includes an **Open in Colab** link.
+
+- [Analyzing census data](analyzing_census_data_sdmx.ipynb)
+- [Analyzing income distribution](analyzing_income_distribution_sdmx.ipynb)
+- [Analyzing obesity prevalence](analyzing_obesity_prevalence_sdmx.ipynb)