SLING-7167 Adjust READMEs

switch from plain text to Markdown

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810528 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/path-based-rtp/README.txt b/path-based-rtp/README.md
similarity index 100%
rename from path-based-rtp/README.txt
rename to path-based-rtp/README.md