diff --git a/.gitignore b/.gitignore
index 1ffc3f5..1bda9c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -200,3 +200,5 @@ ipython_config.py
 hs_err_pid*
 replay_pid*
 
+/handelsregister.db
+/handelsregister.png
diff --git a/.pre-commit-config.yml b/.pre-commit-config.yml
index ec4a8d2..6e86a62 100644
--- a/.pre-commit-config.yml
+++ b/.pre-commit-config.yml
@@ -27,8 +27,8 @@ repos:
   hooks:
   - id: black
     args: [--config=pyproject.toml]
-  # - id: black-jupyter
-  #   args: [--config=pyproject.toml]
+  - id: black-jupyter
+    args: [--config=pyproject.toml]
 
 
 - repo: https://github.com/macisamuele/language-formatters-pre-commit-hooks
diff --git a/Jupyter/API-tests/Api Tests.ipynb b/Jupyter/API-tests/Api Tests.ipynb
new file mode 100644
index 0000000..9e60cbb
--- /dev/null
+++ b/Jupyter/API-tests/Api Tests.ipynb	
@@ -0,0 +1,34 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/documentations/meeting-notes/2023-03-28 b/documentations/meeting-notes/2023-03-28
new file mode 100644
index 0000000..e69de29
diff --git a/documentations/protocoll-2023-04-06 b/documentations/protocoll-2023-04-06
new file mode 100644
index 0000000..de2cf23
--- /dev/null
+++ b/documentations/protocoll-2023-04-06
@@ -0,0 +1 @@
+# protocoll
\ No newline at end of file
diff --git a/documentations/research/resarch-central.md b/documentations/research/resarch-central.md
new file mode 100644
index 0000000..e69de29