added pull request workflow

.github/workflows/pr.yml

@@ -0,0 +1,23 @@
+name: Pull Request
+on: [pull_request]
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.13
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13
+      id: go
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v1
+
+    - name: Build
+      run: go build -v cmd/wtfd.go
+
+    - name: Test
+      run: go test -race -coverprofile=coverage.txt -covermode=atomic ./...