setting up config.yml for ruby-sdk repo

.circleci/config.yml

@@ -0,0 +1,32 @@
+version: 2.1
+
+executors:
+  default:
+    working_directory: ~/sdk
+    docker:
+      - image: cimg/ruby:2.7
+
+jobs:
+  build:
+    executor: default
+    steps:
+      - checkout
+      - setup_remote_docker:
+          docker_layer_caching: true
+      - run:
+          name: Build and run Rubocop
+          command: |
+            gem install bundler
+            bundle install --jobs 4 --retry 3
+            bundle exec rubocop --parallel
+      - run:
+          name: Build and run tests
+          command: |
+            gem install bundler
+            bundle install --jobs 4 --retry 3
+            bundle exec rake tests
+
+workflows:
+  run:
+    jobs:
+      - build