Added README for sample connector

Signed-off-by: Rishabh Gupta<r.g.gupta@outlook.com>

Author: zeerorg

cmd/tester/README.md

@@ -0,0 +1,18 @@
+# Openfaas Sample Connector
+
+This folder contains a sample openfaas connector. You can use this as a base for creating your own connectors.
+For a more complex example checkout [kafka-connector](https://github.com/openfaas-incubator/kafka-connector)
+
+## How to Use
+
+1. Clone this repository: `git clone https://github.com/openfaas-incubator/connector-sdk.git`
+2. Go into the directory: `cd ./connector-sdk/cmd/tester/yaml`
+3. For openfaas deployed on docker swarm do: `docker stack deploy func -c ./docker-compose.yml`
+4. For openfaas deployed on kubernetes do: `kubectl create -f ./kubernetes --namespace openfaas`
+
+To check if it actually works and triggers a function, deploy any function with annotation `topic=faas-request`.
+You can also run this command to deploy a sample function and see `trigger-func` invocation count growing in ui.
+
+```bash
+faas-cli deploy --image=functions/nodeinfo --name=trigger-func --annotation topic=faas-request
+```