Add Runner interface.

testing/resources/consumer_repo/.pre-commit-config.yaml

@@ -0,0 +1,22 @@
+
+-   repo: git@github.com:pre-commit/pre-commit-hooks
+    sha: 76739902911688e8d7b13241409f9facc0e534e4
+    hooks:
+        -   id: pyflakes
+            files: '\.py$'
+        -   id: debug-statements
+            files: '\.py$'
+        -   id: trailing-whitespace
+            files: '\.(py|sh|yaml)$'
+        -   id: name-tests-test
+            files: 'tests/.+\.py$'
+        -   id: end-of-file-fixer
+            files: '\.(py|sh|yaml)$'
+
+-   repo: git@github.com:pre-commit/pre-commit
+    sha: 47b7ca44ed1fcaa83464ed00cef72049ae22c33d
+    hooks:
+        -   id: validate_manifest
+            files: '^manifest.yaml$'
+        -   id: validate_config
+            files: \.pre-commit-config.yaml