added scripts and readme for manual testing (#11)

Signed-off-by: Michael Wilkerson <mwilkerson@hashicorp.com>

testing/README.MD

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+# Usage
+This is for building and testing argo rollout integrations with Consul. For simplicity, everything uses the `make` command. The current version of these manual steps requires a custom build image of the argo controller included in the `install.yaml` file in this directory. Once required changes are made to the argo controller and released, these steps will be updated.
+
+# Prerequisites
+1. Kind is installed on the machine
+2. Helm is installed on the machine
+3. Kubectl is installed on the machine 5
+4. Argo kubectl extension is installed on the machine
+5. The plugin binary is in a directory on the machine 
+6. Update any of the necessary variables in the `Makefile` to match your environment
+
+# Verify v1 to v2 rollout
+1. Run `make setup` to setup the system with the static-server/client, consul and argo. 
+   - Everything is installed to the `default` namespace except for Argo gets installed in the `argo` namespace.
+2. Run `make check-service-splitter` and `make check-service-resolver`
+   - service-splitter shows 100% of traffic directed to stable
+   - service-resolver only has a stable filter (`Service.Meta.version=1`)
+3. Run `make rollout-watch` to watch the deployments
+4. Run `make splitting-watch` to witness the traffic splitting between deployments
+   - You should see 100% of traffic directed to v1
+5. Run `make deploy-canary-v2` to deploy a canary rollout. 
+   - splitting-watch: You should see traffic begin directing to V2 but most of the traffic is still directed to V1
+   - rollout-watch: You should see the rollout now includes a canary deployment for v2
+   - service-splitter: shows 80% of traffic directed to stable and 20% directed to canary
+   - service-resolver: includes a canary filter (`Service.Meta.version=2`)
+6. Run `make promote` to promote the canary deployment and watch it succeed. 
+   - splitting-watch: You should see the traffic slowly shift to V2 until all traffic is directed to V2 and none to V1
+   - rollout-watch: You should see more v2 deployments until there are 5 v1 and 5 v2 deployments. After some time, you should see the v1 deployments scale down to 0
+   - service-splitter: slowly changes the percentages until canary is getting 100% of traffic. Finally, when finished shows 100% of traffic directed to stable
+   - service-resolver: when finished, only has a stable filter (`Service.Meta.version=2`)
+
+# Verify Abort Behavior
+1. Run `Verify v1 to v2 rollout` steps 1-5
+2. Run `make abort` to abort the rollout
+   - splitting-watch: You should see traffic revert to entirely to v1
+   - rollout-watch: You should see the v2 image still exists in a bad state
+3. Run `make retry` to retry the rollout
+   - splitting-watch: You should see traffic begin directing to V2 but most of the traffic is still directed to V1
+   - rollout-watch: You should see the rollout now includes a canary deployment for v2
+4. Run `make promote` to promote the canary deployment and watch it succeed.
+    - splitting-watch: You should see the traffic slowly shift to V2 until all traffic is directed to V2 and none to V1
+    - rollout-watch: You should see more v2 deployments until there are 5 v1 and 5 v2 deployments. After some time, you should see the v1 deployments scale down to 0
+
+# Verify Undo Behavior
+1. Run all steps for `Verify v1 to v2 rollouts`
+2. Run `make undo`. This will begin a rollback to the previous version (v1) 
+   - splitting-watch: You should see traffic begin directing to V2 but most of the traffic is still directed to V1
+   - rollout-watch: You should see the rollout now includes a canary deployment for v1
+3. Run `make promote` to promote the canary deployment and watch it succeed.
+   - splitting-watch: You should see the traffic slowly shift to V1 until all traffic is directed to V1 and none to V2
+   - rollout-watch: You should see more v1 deployments until there are 5 v1 and 5 v2 deployments. After some time, you should see the v2 deployments scale down to 0
+
+