Add steps on proposing changes to Marquez

proposals/README.md

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+# Proposals
+
+Marquez uses a _multi_-project structure and contains the modules [`api`](https://github.com/MarquezProject/marquez/tree/main/api), [`web`](https://github.com/MarquezProject/marquez/tree/main/web), [`clients`](https://github.com/MarquezProject/marquez/tree/main/clients), and [`chart`](https://github.com/MarquezProject/marquez/tree/main/chart). Below, we describe the process for proposing, documenting, and implementing changes to Marquez.
+
+
+## Submitting a Proposal for Review
+
+1. Open a [new issue](https://github.com/MarquezProject/marquez/issues/new) briefly describing your proposal
+2. Work with Marquez [committers](https://github.com/MarquezProject/marquez/blob/main/COMMITTERS.md) to get your proposal reviewed
+
+   > **Note:** Your proposal can have one of two outcomes: _`accepted`_ or _`decline`_; if the proposal is _`declined`_, the process is done.
+
+3. If the proposal is _`accepted`_, the proposal author **must** write a design doc using our [template](https://github.com/MarquezProject/marquez/blob/main/proposals/TEMPLATE.md) for new proposals
+
+   > **Note:** Your proposal **must** be added under [`proposals/`]() using the naming convention: `[#ISSUE]-[SHORT-NAME].md`, where `[#ISSUE]` is the GitHub issue in **Step 1**, and `[SHORT-NAME]` is a shortened name of your proposal (each word seperated by dashes(`-`)).
+
+4. Open a pull request with your proposal for final discussion (please follow our [contributing](https://github.com/MarquezProject/marquez/blob/main/CONTRIBUTING.md) guide)
+
+## Questions?
+
+If you need help with the proposal process, please reach out to us on our [slack](http://bit.ly/MarquezSlack) channel.

proposals/TEMPLATE.md

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+[_Template for proposing changes to Marquez as documented [here](https://github.com/MarquezProject/marquez/blob/main/proposals/README.md)._]
+
+# Proposal: [_Your Title Here_]
+
+Author(s): [_Author, Co-author(s)_]
+
+Created: [_YYYY-MM-DD_]
+
+Dicussion: [_Link to issue with dicussion on the change being proposed._]
+
+## Overview
+
+[_A short summary of the proposal, background, and the problem being solved._]
+
+## Proposal
+
+[_The change being proposed._]
+
+## Implementation
+
+[_A description of implementation steps. We recommend you include any dependencies. If your change requires a database schema migration, please describe the schema modification(s) and whether it's a backwards-incompatible or backwards-compatible change._]
+
+## Next Steps
+
+[_A discussion of related issue(s) for this proposal, who will be assigned to work on them, timeline for when the change being proposed will be worked on, etc. **You may omit this section if there are none.**_]