Create index.md (#694)

* Create index.md

Make landing page for Sui Developer Guides
Aggregate Move resources and Sui API reference
Explain how to navigate site

* Update index.md

Moving quick links from README to Kickstart section on dev guides landing page

* Update index.md

Moved list of quick links back to README, reordered sections, added Wallet and Move quick links

* Update index.md

Add link to newly added white paper

doc/src/index.md

@@ -0,0 +1,39 @@
+---
+title: Sui Developer Guides
+---
+
+Welcome to the documentation for the Sui platform. Since Sui is built upon the core [Move](https://github.com/MystenLabs/awesome-move) programming language,
+you should familiarize yourself with it and use this content to apply the differences. For a summary of these differences, see [Why Sui?](learn/sui-move-diffs.md)
+
+For a deep dive into Sui technology, see the [Sui Smart Contracts Platform](paper/sui.pdf) white paper.
+
+## Kickstart development
+
+### Move quick start
+See the [Move Quick Start](move.md) for installation, defining custom objects, object operations (create/destroy/update/transfer/freeze), publishing, and invoking your published code.
+<!--- Then deeper: Sui standard library, design patterns, examples. --->
+
+### Wallet quick start
+See the [Wallet Quick Start](wallet.md) for installation, querying the chain, client setup, sending transfer transactions, and viewing the effects.
+<!--- Then deeper: wallet CLI vs client service vs forwarder architecture, how to integrate your code (wallet, indexer, ...) with the client service or forwarder components. --->
+
+## Navigate this site
+
+Navigate and search this site however you see fit. Here is the order we recommend if you are new to Sui:
+
+1. [Learn](learn/index.md) about Sui, how it differs from Move, and why you should employ it.
+1. [Build](build/index.md) smart contracts, wallets, authorities, transactions, and more.
+1. [Explore](explore/index.md) NFTs, make transfers, and see the Sui API.
+1. [Contribute]contribute/index.md) to Sui by joining the community, making enhancements, and learning about Mysten Labs.
+
+
+## Use supporting sites
+
+Take note of these related repositories of information to make best use of the knowledge here:
+
+* [Core Move](https://github.com/diem/move/tree/main/language/documentation) documentation, including:
+  * [Tutorial](https://github.com/diem/move/blob/main/language/documentation/tutorial/README.md) - A step-by-step guide through writing a Move module.
+  * [Book](https://github.com/diem/move/blob/main/language/documentation/book/src/introduction.md) - A summary with pages on [various topics](https://github.com/diem/move/tree/main/language/documentation/book/src).
+  * [Examples](https://github.com/diem/move/tree/main/language/documentation/examples/experimental) - A set of samples, such as for [defining a coin](https://github.com/diem/move/tree/main/language/documentation/examples/experimental/basic-coin) and [swapping it](https://github.com/diem/move/tree/main/language/documentation/examples/experimental/coin-swap).
+* [Awesome Move](https://github.com/MystenLabs/awesome-move/blob/main/README.md) - A summary of resources related to Move, from blockchains through code samples.
+* [Sui API Reference](https://app.swaggerhub.com/apis/MystenLabs/sui-api/0.1 ) - The reference files for the Sui Rest API.