Add open issues section (#83)

Author: sebmue-dataport

docs/frontend/10_OpenIssues.md

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+---
+sidebar_position: 11 
+---
+
+# Open Issues
+
+Please collect open issues and workarounds that need to be removed in future in here. Make sure to link to the corresponding tickets.
+
+## Workarounds
+
+### Vuetify v-menu labels not accessible in Safari
+
+A ![Vuetify issue](https://github.com/vuetifyjs/vuetify/issues/22540) required a ![workaround](https://github.com/hpi-schul-cloud/nuxt-client/pull/4050) on our part. Once the issue is resolved in Vuetify and the dependency is updated the commit can be reverted.