MNT: Add codecov.yml configuration file

.github/workflows/codecov.yml

@@ -0,0 +1,35 @@
+coverage:
+  status:
+    project:
+      default:
+        # basic
+        target: auto
+        threshold: 1%
+        base: auto
+        flags:
+          - unit
+        paths:
+          - "rocketpy"
+        # advanced settings
+        branches:
+          - master
+          - develop
+        if_ci_failed: error #success, failure, error, ignore
+        informational: false
+        only_pulls: false
+    patch:
+      default:
+        # basic
+        target: auto
+        threshold: 1%
+        base: auto
+        # advanced
+        branches:
+          - master
+          - develop
+        if_ci_failed: error #success, failure, error, ignore
+        only_pulls: false
+        flags:
+          - "unit"
+        paths:
+          - "rocketpy"