Add Codecov configuration

Author: titouanmathis

codecov.yml

@@ -0,0 +1,26 @@
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+    patch:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+
+comment:
+  layout: "diff, flags, files"
+  behavior: default
+  require_changes: false
+  require_base: false
+  require_head: true
+
+ignore:
+  - "packages/docs/**"
+  - "packages/tests/**"
+  - "**/node_modules/**"
+  - "**/*.spec.ts"
+  - "**/*.test.ts"