[eclipse-kanto#218 ] Add coverage report workflow and badge to README.md

Signed-off-by: Ivan Marinov <ivan.marinov@bosch.io>

.github/workflows/generate-coverage-report.yaml

@@ -0,0 +1,12 @@
+name: Create Coverage
+
+on: 
+  push:
+    branches:
+    - main
+
+jobs:
+  generate-coverage-report:
+    uses: eclipse-kanto/kanto/.github/workflows/coverage-template.yaml@main
+    with: 
+      coverage-command: go test ./... -coverprofile=coverage.out -covermode count

README.md

@@ -2,6 +2,8 @@
 
 # Eclipse Kanto - Container Management
 
+![Coverage](https://github.com/eclipse-kanto/container-management/wiki/coverage.svg)
+
 Eclipse Kanto Container Management adopts cloud-native concepts, approaches and specifications adapted in a
 device-centric fashion achieving a lightweight pluggable management for containers at the edge. It is specially designed
 to be lightweight and easily deployable on a wide range of edge devices and platforms to enable a secured, isolated and