Add dev guidence of consolidating code.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,22 @@
+---
+name: Bug report
+about: Create a bug report
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment ie: OCM version, Kubernetes version and provider:**
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/enhancement_request.md

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+---
+name: Enhancement request
+about: Create a enhancement request
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the enhancement**
+A clear and concise description of what the enhancement request is.

.github/ISSUE_TEMPLATE/other_report.md

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+---
+name: Other report
+about: Non bug or enhancement related issue
+title: ''
+labels: ''
+assignees: ''
+
+---

CONTRIBUTING.md

@@ -10,6 +10,32 @@
 
 # Contributing guidelines
 
+The ocm repo contains 4 core components:
+* registration
+* placement
+* work
+* registration-operator
+
+Before 0.11.0, the 4 components has independent repos, now we are going through [the task of consolidating code](https://github.com/open-cluster-management-io/OCM/issues/128) to merge all code into this repo to gain all kinds of benifits.
+
+We're contiously working on migrate code from `staging` folder to outside. Finally, the `staging` folder will be empty and removed.
+
+Here is a table of the migration status:
+
+| Component | Status |
+| --- | --- |
+| registration | staging |
+| placement | staging |
+| work | staging |
+| registration-operator | staging |
+
+Status:
+* staging: the component is having all code in `staging` folder.
+* mix: the component is having code in both `staging` and outside.
+* done: the component is having all code outside `staging` folder and done of the migration.
+
+If a component is in staging status, you need to contribute code under the `staging` folder.
+
 ## Terms
 
 All contributions to the repository must be submitted under the terms of the [Apache Public License 2.0](https://www.apache.org/licenses/LICENSE-2.0).