added default codecov.yml per https://docs.codecov.io/docs/codecov-yaml#default-yaml
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..a6e1de7
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,20 @@
+codecov:
+ require_ci_to_pass: yes
+
+coverage:
+ precision: 2
+ round: down
+ range: "70...100"
+
+parsers:
+ gcov:
+ branch_detection:
+ conditional: yes
+ loop: yes
+ method: no
+ macro: no
+
+comment:
+ layout: "reach,diff,flags,files,footer"
+ behavior: default
+ require_changes: no