DOCS-#4350: Add release notes template for 0.15.0 (#4351)
DOCS-#4350: Add release notes template for 0.15.0 (#4351)

Signed-off-by: Igoshev, Yaroslav <c92a76d1cf63fd8384660980177b3c53502a7e77@intel.com>
modin-project/modin,modin-project/modin