update sig-node contributing doc

Author: pacoxu

sig-node/CONTRIBUTING.md

@@ -4,68 +4,96 @@ Welcome!
 
 ## For Kubernetes Contributions
 
-https://github.com/kubernetes/community/tree/master/contributors/guide#contributor-guide
+Read the [Kubernetes Contributor Guide](https://github.com/kubernetes/community/tree/master/contributors/guide#contributor-guide).
 
 If you aspire to grow scope in the SIG, please review the [SIG Node contributor ladder](./sig-node-contributor-ladder.md) for SIG specific guidance.
 
-### For Enhancements 
+### For Enhancements
 
-https://github.com/kubernetes/enhancements/tree/master/keps/sig-node
+SIG Node enhancements are available in the <https://github.com/kubernetes/enhancements/tree/master/keps/sig-node>.
 
 #### Helpful Links for Sig-Node
 
-Code:  
+**Code**:  
 
-https://github.com/kubernetes/kubernetes/tree/master/cmd/kubelet  
+For general code organization, read [contributors/devel/README.md](contributors/devel/README.md) for explaning things like
+`vendor/`, `staging`, etc.
 
-https://github.com/kubernetes/kubernetes/tree/master/pkg/kubelet  
+* Kubelet
+  * <https://github.com/kubernetes/kubernetes/tree/master/cmd/kubelet>
+  * <https://github.com/kubernetes/kubernetes/tree/master/pkg/kubelet>
+* Probe: <https://github.com/kubernetes/kubernetes/tree/master/pkg/probe>
+* NodeLifecycle: <https://github.com/kubernetes/kubernetes/tree/master/pkg/controller/nodelifecycle>
+* Node API: <https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/api/node>
+* CRI API: <https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/cri-api>
+* DRA:
+  * <https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/dynamic-resource-allocation>
+  * <https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/kubelet/pkg/apis/dra/>
+  * <https://github.com/kubernetes/kubernetes/tree/master/test/e2e/dra/>
+* E2E test:
+  * <https://github.com/kubernetes/kubernetes/tree/master/test/e2e/node/>
+  * <https://github.com/kubernetes/kubernetes/tree/master/test/e2e_node/>
+* CI (test-infra)
+  * [sig-node jobs](https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes/sig-node/)
+  * [e2e_node jobs](<https://github.com/kubernetes/test-infra/blob/master/jobs/e2e_node/>
+  * [sig-node test-grids](https://github.com/kubernetes/test-infra/blob/master/config/testgrids/kubernetes/sig-node/)
+  * [containerd test-grids](https://github.com/kubernetes/test-infra/blob/master/config/testgrids/kubernetes/containerd/)
 
-https://github.com/kubernetes/kubernetes/tree/master/pkg/probe  
+**Development Resources**:  
 
-Development Resources:  
+* <https://github.com/kubernetes/community/tree/master/contributors/devel#table-of-contents>
 
-https://github.com/kubernetes/community/tree/master/contributors/devel#table-of-contents
+There are two types of end-to-end tests in Kubernetes:
 
-Shared space / Sub projects:  
+* [Cluster end-to-end tests](https://git.k8s.io/community/contributors/devel/sig-testing/e2e-tests.md)
+* [Node end-to-end tests](https://git.k8s.io/community/contributors/devel/sig-node/e2e-node-tests.md)
 
-https://github.com/kubernetes/community/tree/master/contributors/devel/sig-node  
+**Shared space / Sub projects**:  
 
-https://github.com/kubernetes/community/tree/master/sig-node#subprojects
+* <https://github.com/kubernetes/community/tree/master/contributors/devel/sig-node>
+* <https://github.com/kubernetes/community/tree/master/sig-node#subprojects>
 
-Triage:
-https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/triage.md 
+**Triage**:
+
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/triage.md>
+
+**Test Grids**:
+
+* SIG Node overview: <https://testgrid.k8s.io/sig-node>
+* Release Blocking: <https://testgrid.k8s.io/sig-node-release-blocking>
+* Kubelet: <https://testgrid.k8s.io/sig-node-kubelet>
+* Containerd: <https://testgrid.k8s.io/sig-node-containerd>
 
 ## Getting Started
 
 Task #1 : Compile kubelet
-See tips in the root Makefile    
- 
-https://github.com/kubernetes/community/blob/master/contributors/devel/development.md#building-kubernetes
+See tips in the root Makefile:
+
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/development.md#building-kubernetes>
 
 Task #2 : Run a single unit test  
 
-https://github.com/kubernetes/community/blob/master/contributors/devel/development.md#unit-tests
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/development.md#unit-tests>
 
 Task #3 : Explore update/verify scripts  
 
 hack/update-gofmt.sh + hack/verify-gofmt.sh  
 
-https://github.com/kubernetes/kubernetes/blob/master/hack/update-gofmt.sh  
-
-https://github.com/kubernetes/kubernetes/blob/master/hack/verify-gofmt.sh
+* <https://github.com/kubernetes/kubernetes/blob/master/hack/update-gofmt.sh>
+* <https://github.com/kubernetes/kubernetes/blob/master/hack/verify-gofmt.sh>
 
 Task #4 : Explore dependencies  
 
 hack/pin-dependency.sh + hack/update-vendor.sh  
 
-https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/vendor.md
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/vendor.md>
 
 Task #5 : Using local-up-cluster script  
 
-https://github.com/kubernetes/community/blob/master/contributors/devel/running-locally.md#starting-the-cluster  
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/running-locally.md#starting-the-cluster>
 
 Running a local cluster  
 
-https://github.com/kubernetes/community/blob/master/contributors/devel/running-locally.md
-        
+* <https://github.com/kubernetes/community/blob/master/contributors/devel/running-locally.md>
+
 Note: Task 5 requires Linux OS