Create about-sui.md (#757)

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Creating About Sui page with some elements of Announcing Sui blog post

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Incorporating review feedback

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Replace instant with immediate

doc/src/learn/about-sui.md

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+---
+title: About Sui
+---
+
+Sui is a high performance, horizontally-scalable blockchain with no theoretical limits utilizing extremely low computation resources per
+transaction. It is designed from the ground up to facilitate immediate settlement, delivering the high throughput, low latency, and low cost
+needed to power applications for billions of users.
+
+With existing platforms, users pay a huge tax as network usage increases due to limited throughput. This results in terrible user experiences:
+
+* Games become more expensive to play or entirely unplayable
+* Investors lose funds due to inability to liquidate undercollateralized loans in DeFi
+* High NFT minting costs
+* Only high-value use cases can be experienced (not coupons and other valuable, mass market consumer use cases)
+
+## Unparalleled scalability, immediate settlement
+
+Sui scales horizontally as the demands of Dapps increase. Validators can add more workers to increase the networking, storage
+and compute capacity of the network. We are proud to say that Sui is the first proof of stake, decentralized blockchain that scales
+beyond the transaction processing capacities of established rails such as VISA & SWIFT while executing safe, turing complete smart contracts.
+
+For example, a network of validators each running an Apple Macbook Pro worker achieves 30,000 TPS with sub second finality. Sui’s linear
+scalability means validators increase network throughput by adding more workers to meet network demands. This results in low gas fees even
+during periods of high network traffic because the network is able to increase capacity to meet demand. This type of scalability is in sharp
+contrast to how blockchains are typically designed.
+
+Additionally with Sui, you can process in batch at extremely low cost. (e.g. massive airdrop with a single transaction for coupons or other
+valuable, mass market consumer use cases).
+
+## A language for developers
+
+Sui smart contracts are written in the Move language. Move is safe and expressive, and its type system and data model naturally support the
+parallel agreement/execution strategies that make Sui scalable. 
+
+Move is an open-source programming language for building smart contracts originally developed at Facebook for the Diem blockchain. The language is
+platform-agnostic, and in addition to being adopted by Sui, it has been gaining popularity on other platforms (e.g., 0L, StarCoin).
+
+Move is naturally immune from [reentrancy](https://en.wikipedia.org/wiki/Reentrancy_(computing)), a critical flaw that attackers have leveraged to
+steal millions from Dapps. For developers transitioning from web2 to web3, Move is a much more natural platform to build on without having to
+understand the underlying complexities of infrastructure. 
+
+With these extensive properties and benefits, we are confident that Move will become the native execution environment for smart contracts in web3.
+
+## Ability to define richer on-chain assets
+
+Sui permits storage of large objects on-chain, enabling developers to define more complex assets with richer attributes. Additionally, the low-cost
+properties of Sui enable developers to move more of their logic and metadata on-chain, increasing composability and transparency for Dapps.
+
+This enables developers to define richer economies that go beyond scarcity for price discovery. Developers can build evolving and dynamic NFTs to
+unlock/upgrade and bundle depending on the game and other conditions, such as achieving badges.
+
+## Better user experience for web3 apps
+
+We want to make Sui the most accessible smart contracts platform, empowering developers to create great user experiences in web3. To usher in the next
+billion users, developers will need tools to take advantage of the power of the Sui blockchain. The Sui Development Kit (SDK) will enable developers to
+build without boundaries.