Add rpm packaging

This adds rpm packaging for building on Fedora + CentOS + deploying to
Koji.

I've gone ahead and updates notes.txt to a README.md to better reflect
how to build.

This is copied from:
https://src.fedoraproject.org/cgit/rpms/kompose.git
and added as a submodule.

Closes https://github.com/kubernetes-incubator/kompose/issues/481

Ping @surajssd @dustymabe

.gitmodules

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+[submodule "build/rpm"]
+	path = build/rpm
+	url = https://src.fedoraproject.org/cgit/rpms/kompose.git

build/README.md

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+# Fedora RPM packaging
+
+There are instructions on how to build the RPM.
+
+# 1.  Gofed
+
+Grab gofed from https://github.com/gofed/gofed
+
+Choose which version of the repo you want to build. For kompose it was 0.3.0 and the commit was 135165b39c55d29a5426479ded81eddd56bfbaf4
+
+Run the following to generate spec file:
+```sh
+gofed repo2spec --detect github.com/kubernetes-incubator/kompose --commit 135165b39c55d29a5426479ded81eddd56bfbaf4 --with-extra --with-build -f
+```
+
+The spec file is now located at:
+```sh
+$HOME/gofed/golang-github-kubernetes-incubator-kompose/golang-github-kubernetes-incubator-kompose.spec
+```
+
+# 2. Dependencies
+
+Now we need to go through and fix some things.
+
+Generate bundled dependencies by using parsedeps.go
+
+Go to the kompose source folder and then run:
+```sh
+go run parsedeps.go
+```
+
+In the future this will possibly done by `gofed`, see: https://github.com/gofed/gofed/issues/42
+
+
+# 3. Building a source RPM locally on CentOS
+
+First, follow instructions to do local setup https://wiki.centos.org/HowTos/SetupRpmBuildEnvironment
+
+Source: https://wiki.centos.org/HowTos/RebuildSRPM
+
+Second, checkout the source to the release commit
+
+Copy the kompose code directory with name `kompose-135165b39c55d29a5426479ded81eddd56bfbaf4`
+
+Tar the `kompose-135165b39c55d29a5426479ded81eddd56bfbaf4` code directory as `kompose-135165b.tar.gz` and copy it to `$HOME/rpmbuild/SOURCES/`
+
+Run following command:
+```sh
+rpmbuild -ba kompose.spec
+```
+
+Find the srpm in `$HOME/rpmbuild/SRPMS`
+
+Find the RPM in `$HOME/rpmbuild/RPM/arch/`
+
+Check that the dependencies are proper:
+```sh
+rpm -qpR RPMS/x86_64/kompose-0.3.0-0.1.git135165b.el7.centos.x86_64.rpm
+```
+
+# 4. Running in on Koji (build system)
+
+First, setup your environment in order to run Koji: https://fedoraproject.org/wiki/Using_the_Koji_build_system
+
+Example setup:
+```sh
+fedora-packager-setup
+kinit <username>@FEDORAPROJECT.ORG
+```
+
+To build it on koji run:
+```
+koji build --scratch rawhide kompose-0.3.0-0.1.git135165b.el7.centos.src.rpm
+```

build/rpm

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+Subproject commit e6948b607f90bb2ef8fdc97075fc4c6cc73e6063