fix: add yamllint config

.yamllint

@@ -0,0 +1,20 @@
+---
+extends: default
+
+rules:
+  truthy:
+    allowed-values: ["True", "False"]
+  comments:
+    min-spaces-from-content: 1
+  comments-indentation: False
+  line-length: disable
+  braces:
+    min-spaces-inside: 0
+    max-spaces-inside: 1
+  brackets:
+    min-spaces-inside: 0
+    max-spaces-inside: 0
+  indentation: enable
+  octal-values:
+    forbid-implicit-octal: True
+    forbid-explicit-octal: True