Add Makefile and spec file

This is to build an srpm and for convenience.

Options for make: all, clean, install, srpm

Makefile

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+all:
+	npm run build
+
+clean:
+	rm -rf dist/
+	rm -rf _install
+
+install: all
+	mkdir -p /usr/share/cockpit
+	cp -r dist/ /usr/share/cockpit/subscription-manager
+
+srpm: clean all
+	mkdir -p _install/usr/share/cockpit
+	cp -r dist/ _install/usr/share/cockpit/subscription-manager
+	mkdir -p _install/usr/share/metainfo/
+	cp *.metainfo.xml _install/usr/share/metainfo/
+	tar -C _install/ -czf subscription-manager-cockpit.tar.gz .
+	rpmbuild -bs \
+	  --define "_sourcedir `pwd`" \
+          --define "_srcrpmdir `pwd`" \
+          subscription-manager-cockpit.spec

subscription-manager-cockpit.spec

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+Name: subscription-manager-cockpit
+Version: 1
+Release: 0
+Summary: Subscription Manager Cockpit UI
+License: LGPLv2.1+
+
+Source: subscription-manager-cockpit.tar.gz
+BuildArch: noarch
+
+Requires: subscription-manager
+
+%define debug_package %{nil}
+
+%description
+Subscription Manager Cockpit UI
+
+%prep
+
+%build
+
+%install
+mkdir -p %{buildroot}
+tar --strip-components=1 -xzf %{sources} -C %{buildroot}
+find %{buildroot} -type f >> files.list
+sed -i "s|%{buildroot}||" *.list
+
+%files -f files.list