Add Codecov for Tinkerpop/Gremlin-Go (#101)

.github/codecov.yml

@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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
+#
+#   http://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.
+
+ignore:
+  - "**/cucumber"

.github/workflows/build-test.yml

@@ -227,6 +227,11 @@ jobs:
           docker-compose up --exit-code-from gremlin-go-integration-tests
           docker-compose down
 
+      - name: Upload to Codecov
+        uses: codecov/codecov-action@v2
+        with:
+          working-directory: ./gremlin-go
+
       - name: Go-Vet
         working-directory: ./gremlin-go
         run: go vet ./...

gremlin-go/README.md

@@ -22,6 +22,8 @@ for early testing purposes only.
 
 -->
 
+[![codecov](https://codecov.io/gh/apache/tinkerpop/branch/master/graph/badge.svg?token=TojD2nR5Qd)](https://codecov.io/gh/apache/tinkerpop)
+
 # Getting Started
 
 ## Prerequisites