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

rfc/README.md

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+  Licensed to the Apache Software Foundation (ASF) under one or more
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+       http://www.apache.org/licenses/LICENSE-2.0
+
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+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+-->
+# 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`  |