Add a simple .bcr directory.

.bcr/metadata.template.json

@@ -0,0 +1,34 @@
+{
+    "homepage": "https://github.com/grpc/grpc-kotlin",
+    "maintainers": [
+        {
+            "email": "",
+            "github": "bshaffer",
+            "github_user_id": 103941,
+            "name": "Brent Shaffer"
+        },
+        {
+            "email": "",
+            "github": "jamesward",
+            "github_user_id": 65043,
+            "name": "James Ward"
+        },
+        {
+            "email": "",
+            "github": "lowasser",
+            "github_user_id": 544569,
+            "name": "Louis Wasserman"
+        },
+        {
+            "email": "",
+            "github": "duckladydinh",
+            "github_user_id": 22922064,
+            "name": "Lam Gia Thuan"
+        }
+    ],
+    "repository": [
+        "github:grpc/grpc-kotlin"
+    ],
+    "versions": [],
+    "yanked_versions": {}
+}

.bcr/presubmit.yml

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+matrix:
+  platform:
+    - ubuntu2204
+    - macos
+  bazel:
+    - 8.x
+tasks:
+  verify_targets:
+    name: Verify build targets
+    platform: ${{ platform }}
+    bazel: ${{ bazel }}
+    build_flags:
+      - '--cxxopt=-std=c++17'
+      - '--host_cxxopt=-std=c++17'
+    build_targets:
+      - '@grpc_kotlin//...'
+bcr_test_module:
+  module_path: bzl-examples/bzlmod
+  matrix:
+    platform:
+      - ubuntu2204
+      - macos
+    bazel:
+      - 8.x
+  tasks:
+    run_test_module:
+      name: Run test module
+      platform: ${{ platform }}
+      bazel: ${{ bazel }}
+      build_targets:
+        - java/...
+      test_targets:
+        - javatests/...

.bcr/source.template.json

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+{
+    "integrity": "",
+    "strip_prefix": "{REPO}-{VERSION}",
+    "url": "https://github.com/{OWNER}/{REPO}/archive/refs/tags/{TAG}.tar.gz"
+}