ci: README: simple docs for the current CI setup

Describe what we currently do in terms of building on Travis and how
developer can do a local test with the docker build.

diff --git a/.ci/README b/.ci/README
new file mode 100644 (file)
index 0000000..8365a74
--- /dev/null
+++ b/.ci/README
@@ -0,0 +1,21 @@
+Matrix build:
+-------------
+We are building our software on different distributions with the help of docker images. Right now
+we are using versions of Ubuntu, Fedora and Debian.
+
+OSX build:
+----------
+We are using the OSX support of Travis CI to build EFL on OSX. Build testing two combinations: Xcode
+7.3.1 on OS X 10.11 and Xcode 8.3.3 on OS X 10.12.
+
+Run locally:
+------------
+For easy developer testing the CI setup can also be run in full or only parts locally on the
+developers machine. You need to have docker installed and after that it is a simple:
+
+docker pull fedora:26
+docker build -f .ci/Dockerfile-Fedora26 .
+
+Travis:
+-------
+https://travis-ci.org/Enlightenment/efl