meta-ti: add README for meta-ti-extras and update maintainer

Add README for the newly added meta-ti-extras layer and update the maintainer.

Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Reviewed-by: Praneeth Bajjuri <praneeth@ti.com>
Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/README

@@ -29,5 +29,5 @@ Please note - meta-ti mailing list requires subscription for posting:
 https://lists.yoctoproject.org/g/meta-ti
 
 Maintainers:
-Praneeth Bajjuri <praneeth@ti.com>
+Ryan Eatmon <reatmon@ti.com>
 Denys Dmytriyenko <denys@konsulko.com>

meta-ti-extras/README

@@ -0,0 +1,31 @@
+OpenEmbedded/Yocto layer that extends and supplements Texas Instruments BSP layer.
+
+It is hosted on http://git.yoctoproject.org/cgit/cgit.cgi/meta-ti/ with the
+source repository at git://git.yoctoproject.org/meta-ti
+
+
+This layer depends on:
+
+URI: git://git.openembedded.org/openembedded-core
+layers: meta
+branch: master
+
+URI: git://git.yoctoproject.org/meta-arm
+layers: meta-arm
+branch: master
+
+URI: git://git.yoctoproject.org/meta-ti
+branch: master
+revision: HEAD
+layers: meta-ti-bsp
+
+
+Send pull requests, patches, comments or questions to:
+meta-ti@lists.yoctoproject.org
+
+Please note - meta-ti mailing list requires subscription for posting:
+https://lists.yoctoproject.org/g/meta-ti
+
+Maintainers:
+Ryan Eatmon <reatmon@ti.com>
+Denys Dmytriyenko <denys@konsulko.com>