Add README file with build process of selinux-policy rpm package

README

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+## Purpose
+
+SELinux Fedora Policy is a large patch off the mainline. The [fedora-selinux/selinux-policy](https://github.com/selinux-policy/selinux-policy.git) makes Fedora Policy packaging more simple and transparent for developers, upstream developers and users. It is used for applying downstream Fedora fixes, for communication about proposed/committed changes, for communication with upstream and the community. It reflects upstream repository structure to make submitting patches to upstream easy.
+
+## Structure
+
+### github
+On GitHub, we have two repositories (selinux-policy and selinux-policy-contrib ) for dist-git repository.
+
+    $ cd selinux-policy
+    $ git remote -v
+    origin	git@github.com:fedora-selinux/selinux-policy.git (fetch)
+
+
+    $ git branch -r
+    origin/HEAD -> origin/master
+    origin/f27
+    origin/f28
+    origin/master
+    origin/rawhide
+
+    $ cd selinux-policy-contrib
+    $ git remote -v 
+    origin	git@github.com:fedora-selinux/selinux-policy-contrib.git (fetch)
+
+    $ git branch -r
+    origin/HEAD -> origin/master
+    origin/f27
+    origin/f28
+    origin/master
+    origin/rawhide
+
+Note: _master_ branch on GitHub does not reflect master branch in dist-git. For this purpose, we created the _rawhide github branches in both selinux-policy and selinux-policy-contrib repositories.
+
+### dist-git
+Package sources in dist-git are generally composed from a _selinux-policy and _selinux-policy-contrib repository snapshots tarballs and from other config files.
+
+## Build process
+
+1. clone [fedora-selinux/selinux-policy](https://github.com/fedora-selinux/selinux-policy) repository
+	
+		$ cd ~/devel/github
+		$ git clone git@github.com:fedora-selinux/selinux-policy.git
+		$ cd selinux-policy
+
+2. clone [fedora-selinux/selinux-policy-contrib](https://github.com/fedora-selinux/selinux-policy-contrib) repository
+	
+		$ cd ~/devel/github
+		$ git clone git@github.com:fedora-selinux/selinux-policy-contrib.git
+		$ cd selinux-policy-contrib
+
+3. create, backport, cherry-pick needed changes to a particular branch and push them
+
+4. clone **selinux-policy** dist-git repository
+
+		$ cd ~/devel/dist-git
+		$ fedpkg clone selinux-policy 
+		$ cd selinux-policy
+
+4. Download the latest snaphots from selinux-policy and selinux-policy-contrib github repositories
+
+        $ ./make-rhat-patches.sh
+
+5. add changes to the dist-git repository, bump release, create a changelog entry, commit and push
+6. build the package
+	
+         $ fedpkg build
+