Add README

README.md

+# Metadata of Historic Postcards
+
+Get a first impression of the metadata we provide on [labs.onb.ac.at](https://labs.onb.ac.at/en/dataset/akon/) using
+Jupyter Notebooks.
+
+## [AKON Data Overview](AKON Data Overview.ipynb)
+
+We use [pandas](https://pandas.pydata.org/) to get a quick impression of the data. This includes counting the number of
+datasets, getting random samples and counting datasets with a certain property.
+
+## [All the Mountains](All the Mountains.ipynb)
+
+Again using pandas we take a closer look at a specific use case: Finding all postcards that were identified as featuring
+mountains.