docs: add WIP purpose doc page

website/versioned_docs/version-v1.x/purpose.md

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+---
+title: Why MACI Matters
+description: An overview of the purpose of MACI
+sidebar_label: Purpose
+sidebar_position: 2
+---
+
+# Why MACI Matters
+
+- Voting is important
+- What a voting process needs
+- Why bother with blockchain voting?
+
+## The potential of e-voting and blockchain voting
+
+To understand the promise of on-chain voting, we highly recommend reading [Vitalik's post on blockchain voting](https://vitalik.eth.limo/general/2021/05/25/voting2.html). He provides a high-level overview of the incredible potential of e-voting and why blockchains are an excellent technology to implement e-voting solutions on top of.
+
+To summarize Vitalik's a
+
+## Security requirements of a voting system
+
+<!-- TODO add markdown table of my voting presentation -->
+
+### IRL
+
+<!-- TODO add markdown table of my voting presentation -->
+
+### Blockchain voting
+
+<!-- TODO add markdown table of my voting presentation -->
+
+### Blockchain voting with ZKPs
+
+<!-- TODO add markdown table of my voting presentation -->