Add instructions on importing to readme

README.md

-# CodiMD note exporter
+# CodiMD Note Exporter + Hedgedoc Note Importer
 
-This little tool is intended to help you backup the notes that you have in your CodiMD history to a
-local folder. It complements CodiMD's "export user data" functionality, which only downloads
-documents that you own.
+This little tool is intended to help you **backup** the notes that your CodiMD history shows to a local folder.
+It complements CodiMD's "export user data" functionality, which only downloads
+documents that you are the owner of.
+This backup is not meant to be uploaded by you in its entirety, since this would create ownership issues of shared
+documents.
+
+The export user data functionality of CodiMD creates an archive containing all the documents you are the owner of.
+This tool furthermore implements functionality to upload each or a selection of your owned documents based on this
+archive.
+Based upon the path the document was served under at CodiMD, this script tries to migrate the document to the exact same
+path if possible, e.g., https://md.inf.tu-dresden.de/my_custom_path gets mapped
+to https://md.inf.tu-dresden.de/notes/my_custom_path
+
+Be aware that this approach is a little hacky.
+Unfortunately, this is necessary since our CodiMD instance did use KeyCloak as an OAuth provider.
+
+Follow the steps closely to ensure that everything works as intended and that the ownership of documents is not messed
+up.
 
 ## Requirements
 
@@ -10,9 +25,21 @@ Its only dependency is Python >= 3.7 (use `python3 -V` to check your version).
 
 ## Usage
 
-### 1. Extract value of the session cookie
+After cloning this repository, follow the following steps to migrate your documents.
+If you only want to export your visited documents and import them manually, just follow steps 2 and 4.
+
+### 1. Export Your Owned Documents From Our Codimd Instance and Weed Them Out
+
+- Go to https://md.inf.tu-dresden.de/
+- Click on your username in the upper right and hit "*Export user data*"
+- Download the file "archive.zip" and place it in the same folder as this file (README.md)
+- **Weed the archive out**! Most likely, it will contain a lot of unused or empty documents. Delete those files in place
+  in the archive, don't extract them.
 
-First of all, you need to extract the value of the `connect.sid` browser cookie for the
+### 2. Extract the value of your CodiMD session cookie
+
+To ensure that the script can access the documents you accessed in our CodiMD instance, you need to extract the value of
+the `connect.sid` browser cookie for the
 particular CodiMD instance that you use (e.g., `md.inf.tu-dresden.de`).
 
 This procedure is necessary because the CodiMD login is handled externally by Keycloak.
@@ -22,38 +49,34 @@ password**. Don't share it with others!
 
 Now, the instructions are similar for Chrome and Firefox:
 
-1. Navigate your browser to the CodiMD instance.
-2. Open developer tools.
+1. Navigate your browser to the [CodiMD instance](https://md.inf.tu-dresden.de/). Be sure that you are logged in
+2. Open developer tools (F12).
 3. **Chrome**: go to the "Application" tab. **Firefox**: go to the "Storage" tab ("Web-Speicher").
 4. Un-collapse "Cookies".
 5. In the list, search for a cookie with the name `connect.sid`
 6. Select and copy the value. It must start with the character sequence `s%3A`.
 
+### 3. Extract the value of your HedgeDoc session cookie
+
+Follow the instructions from step 2, but copy the value of the cookie key `connect.hedgeDoc.sid`
 
-### 2. Execute the script via the command line
+### 4. Execute the script via the command line
 
-Clone this repository to a path of your liking and just execute `./codimd_export.py` in a
-shell. The script will ask for your session id and download the notes to the relative path
+Execute `./md-import-export.py` or `python3 md-import-export.py` in a
+shell. The script will ask for your session ids and download the notes you visited to the relative path
 `./codimd-documents`.
 
 Please note that your CodiMD history might reference already deleted notes or notes you no
 longer have access to. The URLs of these inaccessible notes are listed as part of the
-script's output.
-
-
-### Example
-
-    $️ ./codimd_export.py
-    Please provide your CodiMD session id (connect.sid cookie):
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/TOPofLSB
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/6jeKGnJnSp6H0f0mVnBwQQ
-    HTTP 403 Forbidden: https://md.inf.tu-dresden.de/klausur-2020-experiences
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/iQVB7TO-QXqi3hGSZ7J4Eg
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/LSB-2020-11-17
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/Nzbj13ydRLe1d0fRCyG6cA
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/LSB-2021-02-02
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/LSB-2021-06-22
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/LSB-2021-12-07
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/ThesisTemplateBachelor
-    HTTP 404 Not Found: https://md.inf.tu-dresden.de/cnoGl7hoTaK1JIh2-u-h0g
-    Done: 163 notes successfully downloaded, 11 not accessible.
+output of the script.
+
+Furthermore, the script tries to upload every file with a `.md` extension to our HedgeDoc instance.
+
+### 5. Visit the Uploaded Documents to Make Them Appear in Your Hedgedoc History
+
+Uploading the documents is not enough to make them appear in your HedgeDoc history.
+You need to visit them at least once to make them available.
+The script automatically generates a file `history_scripts/hedgedocu_documents_to_visit.url`.
+You can either visit every file manually or execute the bash script `history_scripts/visit_migrated_documents.sh`.
+This script will ask you for a browser to open the documents and then open them in batches of 50 URLs.
+Be aware: this might be pretty resource intensive and might take a while.