Add initial bc-linter configuration (#161319)

Preparation for pytorch/test-infra#7016

Currently merging this PR is a noop change for PyTorch repo (bc-linter is not looking at the config yet).
Pull Request resolved: #161319
Approved by: https://github.com/seemethere, https://github.com/ZainRizvi

Author: izaitsevfb

.bc-linter.yml

@@ -0,0 +1,15 @@
+version: 1
+paths:
+include:
+  - "**/*.py"
+exclude:
+  - ".*"
+  - ".*/**"
+  - "**/.*/**"
+  - "**/.*"
+  - "**/_*/**"
+  - "**/_*.py"
+  - "**/test/**"
+  - "**/benchmarks/**"
+  - "**/test_*.py"
+  - "**/*_test.py"