Added elementary docs for Topeax

Author: x-tabdeveloping

docs/Topeax.md

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+# Topeax
+
+Topeax is a probabilistic topic model based on the Peax clustering model, which finds topics based on peaks in point density in the embedding space.
+It can recover the number of topics automatically.
+
+<br>
+<figure>
+  <img src="../images/peax.png" width="100%" style="margin-left: auto;margin-right: auto;">
+  <figcaption>Schematic overview of the steps of the Peax clustering algorithm</figcaption>
+</figure>
+
+:warning: **This part of the documentation is still under construction, as more details and a paper are on their way.** :warning:
+
+## API Reference
+
+::: turftopic.models.topeax.Topeax
+
+::: turftopic.models.topeax.Peax