expose kafkaURI; add sdcore-prom-kafka chart

Change-Id: I43a7d9875dc2d9d4739c0abd745a51062940a70b
diff --git a/sdcore-prom-kafka/.helmignore b/sdcore-prom-kafka/.helmignore
new file mode 100644
index 0000000..862263b
--- /dev/null
+++ b/sdcore-prom-kafka/.helmignore
@@ -0,0 +1,25 @@
+# SPDX-FileCopyrightText: 2021 Open Networking Foundation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj