PVAYLADEV-438 fix README.md links to markdown
PVAYLADEV-438 fix README.md links to markdown

vrk-kpa/X-Road,vrk-kpa/X-Road,vrk-kpa/X-Road,ria-ee/X-Road,ria-ee/X-Road,vrk-kpa/X-Road,ria-ee/X-Road,vrk-kpa/X-Road,vrk-kpa/X-Road,vrk-kpa/X-Road,ria-ee/X-Road,ria-ee/X-Road,ria-ee/X-Road,ria-ee/X-Road,ria-ee/X-Road,vrk-kpa/X-Road