[MINOR] Add a RFC template and folder (apache#3726)

Author: vinothchandar

rfc/README.md

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+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+# RFCs
+ - The RFC process is documented on our [site](https://hudi.apache.org/contribute/rfc-process). Please familiarize yourself with it, before working a new RFC.
+ - Status can be one of these values: `UNDER REVIEW` (or) `IN PROGRESS` (or) `ABANDONED` (or) `COMPLETED`.
+
+The list of all RFCs can be found here.
+
+> This list is a work-in-progress. For all the existing RFCs, please go [here](https://cwiki.apache.org/confluence/display/HUDI/RFC+Process) for now.
+
+
+| RFC Number    | Title         | Status       |
+| ------------- | ------------- |------------- |
+| ...             | ...  | ... |
+| [34](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=188745980)             | Hudi BigQuery Integration  |`UNDER REVIEW`  |
+| [35](https://cwiki.apache.org/confluence/display/HUDI/RFC-35%3A+Make+Flink+MOR+table+writer+in+a+streaming+way)  | Make Flink MOR table writing streaming friendly  | `UNDER REVIEW`  |

rfc/template.md

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+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+# RFC-[number]: [Title]
+
+
+
+## Proposers
+
+- @<proposer1 github username>
+- @<proposer2 github username>
+
+## Approvers
+ - @<approver1 github username>
+ - @<approver2 github username>
+
+## Status
+
+JIRA: <link to umbrella JIRA>
+
+> Please keep the status updated in `rfc/README.md`.
+
+## Abstract
+
+Describe the problem you are trying to solve and a brief description of why it’s needed
+
+## Background
+Introduce any much background context which is relevant or necessary to understand the feature and design choices.
+
+## Implementation
+Describe the new thing you want to do in appropriate detail, how it fits into the project architecture. 
+Provide a detailed description of how you intend to implement this feature.This may be fairly extensive and have large subsections of its own. 
+Or it may be a few sentences. Use judgement based on the scope of the change.
+
+## Rollout/Adoption Plan
+
+ - What impact (if any) will there be on existing users? 
+ - If we are changing behavior how will we phase out the older behavior?
+ - If we need special migration tools, describe them here.
+ - When will we remove the existing behavior
+
+## Test Plan
+
+Describe in few sentences how the RFC will be tested. How will we know that the implementation works as expected? How will we know nothing broke?.