LCORE-1652: Add release candidates versions

Author: tisnik

docs/versions_supported.md

@@ -2,8 +2,10 @@
 
 Dates shown in italic are scheduled and can be adjusted.
 
-| Branch | Schedule   | Status      | First release | End of life |
-|--------|------------|-------------|---------------|-------------|
-| 0.5.0  | 2026-03-01 | Bugfix      | 2026-03-31    | 2026-09-01  |
-| 0.6.0  | 2026-04-01 | Current     |               | 2026-11-30  |
-| 0.7.0  | 2026-07-01 | Future      |               | 2027-01-31  |
+| Branch   | Schedule   | Status      | First release | End of life   |
+|----------|------------|-------------|---------------|---------------|
+| 0.5.0    | 2026-03-01 | Bugfix      | 2026-03-31    | 2026-09-01    |
+| 0.6.0rc1 | 2026-04-01 | Current     | to be decided | to be decided |
+| 0.6.0rc2 | 2026-05-01 | Future      | to be decided | to be decided |
+| 0.6.0    | 2026-06-01 | Future      |               | 2026-11-30    |
+| 0.7.0    | 2026-07-01 | Future      |               | 2027-01-31    |