README: Add TODO section + change some titles.

README.md

 Custom ebuild needed for NayuOS and added to the existing overlays.
 
 # re6st
-## Existing ebuilds original sources
+## Existing ebuilds
 ### net-libs/miniupnpc
 Source: https://gitweb.gentoo.org/repo/gentoo.git/plain/net-libs/miniupnpc/miniupnpc-1.8.ebuild
 
@@ -15,7 +15,7 @@ Original: http://data.gpo.zugaina.org/eigenlay/net-misc/babeld/babeld-9999.ebuil
 ### net-misc/re6stnet
 
 # flask
-## Existing ebuilds original sources
+## Existing ebuilds
 ### blinker
 Original: https://gitweb.gentoo.org/repo/gentoo.git/plain/dev-python/blinker/blinker-1.4.ebuild
 ### itsdangerous
@@ -26,5 +26,8 @@ Original: https://gitweb.gentoo.org/repo/gentoo.git/plain/dev-python/werkzeug/we
 Original: https://gitweb.gentoo.org/repo/gentoo.git/plain/dev-python/flask/flask-0.10.1-r2.ebuild
 
 # cryptsetup
-## Existing ebuilds original sources
+## Existing ebuilds
 Original: https://gitweb.gentoo.org/repo/gentoo.git/plain/sys-fs/cryptsetup/cryptsetup-1.6.5.ebuild
+
+# TODO
+- it could be nice to create our own portage overlay instead of adding to Chromium OS's one
\ No newline at end of file