chore: added yaml linter configs

Author: manchenkoff

.yamlfmt.yaml

@@ -0,0 +1,4 @@
+# https://github.com/google/yamlfmt/blob/main/docs/config-file.md
+formatter:
+  type: basic
+  include_document_start: false

.yamllint.yaml

@@ -0,0 +1,6 @@
+# https://yamllint.readthedocs.io/en/stable/rules.html
+extends: default
+rules:
+  document-start:
+    present: false
+  truthy: false