add slack invitation to project readme

README.md

@@ -14,11 +14,11 @@ Volcano is a batch system built on Kubernetes. It provides a suite of mechanisms
 Kubernetes that are commonly required by many classes of batch & elastic workload including:
 
 1. machine learning/deep learning,
-2. bioinformatics/genomics 
+2. bioinformatics/genomics
 3. other "big data" applications.
 
 These types of applications typically run on generalized domain
-frameworks like Tensorflow, Spark, PyTorch, MPI, etc, which Volcano integrates with.
+frameworks like TensorFlow, Spark, PyTorch, MPI, etc, which Volcano integrates with.
 
 Some examples of the mechanisms and features that Volcano adds to Kubernetes are:
 
@@ -37,7 +37,7 @@ Some examples of the mechanisms and features that Volcano adds to Kubernetes are
     5. Reservations and backfills
     6. Topology-based scheduling
 3. Runtime extensions, e.g:
-    1. Support for specialized continer runtimes like Singularity,
+    1. Support for specialized container runtimes like Singularity,
        with GPU accelerator extensions and enhanced security features.
 4. Other
     1. Data locality awareness and intelligent scheduling
@@ -79,7 +79,7 @@ helm install volcano/volcano --namespace <namespace> --name <specified-name>
 e.g :
 helm install volcano/volcano --namespace volcano-trial --name volcano-trial
 ```
- 
+
 ## Cloning Code
 ### Pre-requisites
 
@@ -103,15 +103,15 @@ make images
 ## Verify your images
 # docker images
 REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
-volcanosh/vc-admission     latest              a83338506638        8 seconds ago       41.4MB
-volcanosh/vc-scheduler    latest              faa3c2a25ac3        9 seconds ago       49.6MB
-volcanosh/vc-controllers   latest              7b11606ebfb8        10 seconds ago      44.2MB
+volcanosh/vc-admission          latest              a83338506638        8 seconds ago       41.4MB
+volcanosh/vc-scheduler          latest              faa3c2a25ac3        9 seconds ago       49.6MB
+volcanosh/vc-controllers        latest              7b11606ebfb8        10 seconds ago      44.2MB
 
-``` 
+```
 
 **NOTE**:
 1. You need ensure the images are correctly loaded in your kubernetes cluster, for
-example, if you are using [kind cluster](https://github.com/kubernetes-sigs/kind), 
+example, if you are using [kind cluster](https://github.com/kubernetes-sigs/kind),
 try command ```kind load docker-image <image-name>:<tag> ``` for each of the images.
 2. When reinstall the volcano charts, since tiller server will not manage CRD resource,
 you need to delete them manually eg: `kubectl delete crds xxxx` before reinstalling or try command with `--no-crd-hook` option.
@@ -132,15 +132,15 @@ To verify your installation run the following commands:
 
 ```
 #1. Verify the Running Pods
-# kubectl get pods --namespace <namespace> 
-NAME                                                READY   STATUS    RESTARTS   AGE
+# kubectl get pods --namespace <namespace>
+NAME                                                 READY   STATUS    RESTARTS   AGE
 <specified-name>-admission-84fd9b9dd8-9trxn          1/1     Running   0          43s
 <specified-name>-controllers-75dcc8ff89-42v6r        1/1     Running   0          43s
 <specified-name>-scheduler-b94cdb867-89pm2           1/1     Running   0          43s
 <specified-name>--admission-init-qbtmb               0/1     Completed 0          43s
 
 #2. Verify the Services
-# kubectl get services --namespace <namespace> 
+# kubectl get services --namespace <namespace>
 NAME                                     TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
 <specified-name>-admission-service       ClusterIP   10.105.78.53   <none>        443/TCP   91s
 
@@ -151,7 +151,9 @@ NAME                                     TYPE        CLUSTER-IP     EXTERNAL-IP
 
 You can reach the maintainers of this project at:
 
-Slack: [#volcano-sh](http://t.cn/Efa7LKx)
+Slack: [#volcano-sh](volcano-slack). (Signup [here](slack-invitation)).
 
 Mailing List: https://groups.google.com/forum/#!forum/volcano-sh
 
+[volcano-slack]: https://volcano-sh.slack.com
+[slack-invitation]: https://join.slack.com/t/volcano-sh/shared_invite/enQtNTU5NTU3NDU0MTc4LTgzZTQ2MzViNTFmNDg1ZGUyMzcwNjgxZGQ1ZDdhOGE3Mzg1Y2NkZjk1MDJlZTZhZWU5MDg2MWJhMzI3Mjg3ZTk