ci: add .codecov.yml for codecov.io configuration

This is the default config with the exclusion of tests/samples added for
Zephyr.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

.codecov.yml

@@ -0,0 +1,31 @@
+codecov:
+  notify:
+    require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+
+  status:
+    project: yes
+    patch: yes
+    changes: no
+
+#ignore:
+#  - "tests/**/*"
+#  - "samples/**/*"
+#  - "ext/hal/**/*"
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "reach, diff, flags, files, footer"
+  behavior: default
+  require_changes: no