add Dockerfile and kubernetes example

Dockerfile

@@ -0,0 +1,11 @@
+from golang:1.10 as builder
+arg CMD
+run wget -o/dev/null -O/usr/local/bin/dep https://github.com/golang/dep/releases/download/v0.3.2/dep-linux-amd64 && \
+        chmod +x /usr/local/bin/dep
+workdir ${GOPATH}/src/github.com/czerwonk/bird_exporter
+copy . .
+run make deps build && cp bird_exporter /bird_exporter
+
+from golang:1.10
+copy --from=builder /bird_exporter /bird_exporter
+entrypoint ["/bird_exporter"]

examples/kubernetes/daemonset.yaml

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+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: bird-exporter
+  namespace: kube-system
+  labels:
+    app: bird-exporter
+spec:
+  updateStrategy:
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: bird-exporter
+    spec:
+      tolerations:
+      - key: node-role.kubernetes.io/master
+        effect: NoSchedule
+      containers:
+      - name: bird-exporter
+        image: bird_exporter:latest
+        args: ["-format.new=true", "-bird.socket=/var/run/bird/bird.ctl"]
+        resources:
+          limits:
+            cpu: 100m
+            memory: 32Mi
+          requests:
+            cpu: 100m
+            memory: 32Mi
+        volumeMounts:
+        - mountPath: /var/run/bird/
+          name: bird-socket
+          readOnly: true
+        ports:
+          - containerPort: 9324
+            name: metrics
+      volumes:
+      - name: bird-socket
+        hostPath:
+          path: /var/run/bird/