implemented ci/cd pipeling for testing and deploying application to crates io

.gitlab-ci.yml

@@ -0,0 +1,21 @@
+workflow:
+  rules: 
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "main"'
+
+default:
+  image: 'rust:slim'
+
+build:
+  script:
+    - cargo build
+
+test: 
+  script:
+    - cargo test
+
+publish:
+  script:
+    - export CARGO_REGISTRY_TOKEN=$CARGO_TOKEN
+    - cargo publish
+
+