pw_blob_store: Add API for blob storage

Add the initial module and header for the blob storage API

Change-Id: I1163305a384b067e9e04a8f676a04d8e8e9ea653
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/14040
Reviewed-by: Ewout van Bekkum <ewout@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: David Rogers <davidrogers@google.com>
diff --git a/pw_blob_store/BUILD.gn b/pw_blob_store/BUILD.gn
new file mode 100644
index 0000000..3022b97
--- /dev/null
+++ b/pw_blob_store/BUILD.gn
@@ -0,0 +1,45 @@
+# Copyright 2020 The Pigweed Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+# gn-format disable
+import("//build_overrides/pigweed.gni")
+
+import("$dir_pw_build/target_types.gni")
+import("$dir_pw_docgen/docs.gni")
+import("$dir_pw_unit_test/test.gni")
+config("default_config") {
+  include_dirs = [ "public" ]
+}
+
+pw_source_set("pw_blob_store") {
+  public_configs = [ ":default_config" ]
+  public = [ "public/pw_blob_store/blob_store.h" ]
+  public_deps = [
+    dir_pw_kvs,
+    dir_pw_status,
+    dir_pw_stream,
+  ]
+}
+
+pw_test_group("tests") {
+  tests = [ ":blob_store_test" ]
+}
+
+pw_test("blob_store_test") {
+  deps = [ ":pw_blob_store" ]
+}
+
+pw_doc_group("docs") {
+  sources = [ "docs.rst" ]
+}