Merge branch 'add-webex' into 'develop'

add card on attending webex

See merge request R3/howto-cards!102

external/general/attend-webex/attend-webex.md

+# Attend the LCSB Team Meeting online (webex)
+
+If you want to attend a webex meeting (e.g., the LCSB Team Meeting), download first the Cisco Webex Client from [here](https://unilu.webex.com).
+
+**Note:** On macOS, you might have to grant permission first to run the Cisco Webex Client.
+
+You usually have received a link from the organizer to the meeting. If you click on that link, you will get redirected to a page similar to this one:
+
+  ![](img/image1.png)
+
+
+You can then login with your university credentials. Once you logged in, a popup will prompt you to join the meeting:
+
+![](img/image2.png)
+
+**Note:** On Windows, you might not be asked for a password.
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