Update README.md regarding room upgrades (#696)

* Update README.md regarding room upgrades

Signed-off-by: Mikhail Aheichyk <mikhail.aheichyk@nordeck.net>

* Update README.md room upgrades docs about NeoDateFix

Signed-off-by: Mikhail Aheichyk <mikhail.aheichyk@nordeck.net>

* Fix widget name

Signed-off-by: Mikhail Aheichyk <mikhail.aheichyk@nordeck.net>

* Update README.md

Co-authored-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>
Signed-off-by: maheichyk <mikhail.aheichyk@gmail.com>

* grammar

Signed-off-by: Kim Brose <kim.brose@nordeck.net>

* fix heading levels

Signed-off-by: Kim Brose <kim.brose@nordeck.net>

---------

Signed-off-by: Mikhail Aheichyk <mikhail.aheichyk@nordeck.net>
Signed-off-by: maheichyk <mikhail.aheichyk@gmail.com>
Signed-off-by: Kim Brose <kim.brose@nordeck.net>
Co-authored-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>
Co-authored-by: Kim Brose <kim.brose@nordeck.net>

Author: maheichyk

README.md

@@ -1,4 +1,4 @@
-# Matrix Poll
+# NeoChoice
 
 ![CI](https://github.com/nordeck/matrix-poll/workflows/CI/badge.svg)
 [![Matrix](https://img.shields.io/matrix/nordeck%3Amatrix.org)](https://matrix.to/#/#nordeck:matrix.org)
@@ -144,6 +144,18 @@ cosign verify \
 ghcr.io/nordeck/matrix-poll-widget:<version> | jq
 ```
 
+## Matrix Room Upgrades
+
+The widget room can be [upgraded](https://matrix.org/docs/communities/administration/#room-upgrades).
+Before the upgrade it is strongly recommended to download any necessary poll data by exporting it as PDF.
+After the upgrade, the poll widget needs to be configured in the new room.
+
+If you are using the widget as part of [NeoDateFix](https://github.com/nordeck/matrix-meetings), then
+please refer to its [documentation](https://github.com/nordeck/matrix-meetings/blob/main/README.md#matrix-room-upgrades)
+about room upgrades.
+
+Matrix room version 12 is supported from NeoChoice version [1.6.0](https://github.com/nordeck/matrix-poll/releases/tag/v1.6.0).
+
 ## License
 
 This project is licensed under [APACHE 2.0](./LICENSE).