Add makefile for creating zip and do releases

The 'dist' target create a zip file to install on the Kodi instance,
and the 'prepare_release' target fetch the Kodi addon repo git
repository and copy the latest add-on there for pushing to the official
addon collection.

Makefile

@@ -0,0 +1,28 @@
+ADDON_NAME := $(shell grep '<addon id="' addon.xml |cut -d\" -f2)
+VERSION := $(shell grep '  version=' addon.xml |cut -d\" -f2)
+FILES = addon.py addon.xml changelog.txt fanart.jpg icon.png LICENSE.txt \
+  main.py nrktv.py resources subs.py
+REPO_PLUGINS ?= ../repo-plugins
+RELEASE_BRANCH ?= matrix
+
+all: dist
+
+dist:
+	mkdir -p tmpdir/plugin.$(ADDON_NAME)
+	cp -r $(FILES) tmpdir/plugin.$(ADDON_NAME)/
+	(cd tmpdir; zip -r ../plugin.$(ADDON_NAME)-$(VERSION).zip plugin.$(ADDON_NAME)/ \
+		--exclude \*.pyc)
+	rm -r tmpdir/plugin.$(ADDON_NAME)
+	rmdir tmpdir
+
+prepare_release:
+	[ -d "$(REPO_PLUGINS)" ] || \
+		git clone --depth 5 -b $(RELEASE_BRANCH) https://github.com/xbmc/repo-scripts "$(REPO_PLUGINS)"
+	git -C $(REPO_PLUGINS) stash
+	git -C $(REPO_PLUGINS) checkout $(RELEASE_BRANCH)
+	rm -rf $(REPO_PLUGINS)/plugin.$(ADDON_NAME)
+	mkdir $(REPO_PLUGINS)/plugin.$(ADDON_NAME)
+	cp -r $(FILES) $(REPO_PLUGINS)/plugin.$(ADDON_NAME)/
+
+clean:
+	rm *.zip