Copy docsite landing to readme (#2058)

* Copy docsite landing to readme

* Fix code sample

* Apply suggestions from code review

Co-Authored-By: Francisco Giordano <frangio.1@gmail.com>

* Update code sample

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

README.md

@@ -4,19 +4,27 @@
 [![Build Status](https://circleci.com/gh/OpenZeppelin/openzeppelin-contracts.svg?style=shield)](https://circleci.com/gh/OpenZeppelin/openzeppelin-contracts)
 [![Coverage Status](https://codecov.io/gh/OpenZeppelin/openzeppelin-contracts/graph/badge.svg)](https://codecov.io/gh/OpenZeppelin/openzeppelin-contracts)
 
-**OpenZeppelin Contracts is a library for secure smart contract development.** It provides implementations of standards like ERC20 and ERC721 which you can deploy as-is or extend to suit your needs, as well as Solidity components to build custom contracts and more complex decentralized systems.
+**A library for secure smart contract development.** Build on a solid foundation of community-vetted code.
 
-## Install
+ * Implementations of standards like [ERC20](https://docs.openzeppelin.com/contracts/erc20) and [ERC721](https://docs.openzeppelin.com/contracts/erc721).
+ * Flexible [role-based permissioning](https://docs.openzeppelin.com/contracts/access-control) scheme.
+ * Reusable [Solidity components](https://docs.openzeppelin.com/contracts/utilities) to build custom contracts and complex decentralized systems.
+ * First-class integration with the [Gas Station Network](https://docs.openzeppelin.com/contracts/gsn) for systems with no gas fees!
+ * Audited by leading security firms.
 
-```
-npm install @openzeppelin/contracts
+## Overview
+
+### Installation
+
+```console
+$ npm install @openzeppelin/contracts
 ```
 
-OpenZeppelin Contracts features a stable API, which means your contracts won't break unexpectedly when upgrading to a newer minor version. You can read ṫhe details in our [API Stability] document.
+OpenZeppelin Contracts features a [stable API](https://docs.openzeppelin.com/contracts/releases-stability#api-stability), which means your contracts won't break unexpectedly when upgrading to a newer minor version.
 
-## Usage
+### Usage
 
-To write your custom contracts, import ours and extend them through inheritance.
+Once installed, you can use the contracts in the library by importing them:
 
 ```solidity
 pragma solidity ^0.5.0;
@@ -25,18 +33,35 @@ import "@openzeppelin/contracts/token/ERC721/ERC721Full.sol";
 import "@openzeppelin/contracts/token/ERC721/ERC721Mintable.sol";
 
 contract MyNFT is ERC721Full, ERC721Mintable {
-  constructor() ERC721Full("MyNFT", "MNFT") public {
-  }
+    constructor() ERC721Full("MyNFT", "MNFT") public {
+    }
 }
 ```
 
-> You need an ethereum development framework for the above import statements to work! Check out these guides for [OpenZeppelin CLI], [Truffle], [Embark] or [Buidler].
+_If you're new to smart contract development, head to [Developing Smart Contracts](https://docs.openzeppelin.com/contracts/learn::developing-smart-contracts) to learn about creating a new project and compiling your contracts._
+
+To keep your system secure, you should **always** use the installed code as-is, and neither copy-paste it from online sources, nor modify it yourself.
+
+## Learn More
+
+The guides in the sidebar will teach about different concepts, and how to use the related contracts that OpenZeppelin Contracts provides:
 
-On our site you will find a few [guides] to learn about the different parts of OpenZeppelin, as well as [documentation for the API][API docs]. Keep in mind that the API docs are work in progress, and don’t hesitate to ask questions in [our forum][forum].
+* [Access Control](https://docs.openzeppelin.com/contracts/access-control): decide who can perform each of the actions on your system.
+* [Tokens](https://docs.openzeppelin.com/contracts/tokens): create tradeable assets or collectives, and distribute them via [Crowdsales](https://docs.openzeppelin.com/contracts/crowdsales).
+* [Gas Station Network](https://docs.openzeppelin.com/contracts/gsn): let your users interact with your contracts without having to pay for gas themselves.
+* [Utilities](https://docs.openzeppelin.com/contracts/utilities): generic useful tools, including non-overflowing math, signature verification, and trustless paying systems.
+
+The [full API](https://docs.openzeppelin.com/contracts/api/token/ERC20) is also thoroughly documented, and serves as a great reference when developing your smart contract application. You can also ask for help or follow Contracts's development in the [community forum](https://forum.openzeppelin.com).
+
+Finally, you may want to take a look at the [guides on our blog](https://blog.openzeppelin.com/guides), which cover several common use cases and good practices.. The following articles provide great background reading, though please note, some of the referenced tools have changed as the tooling in the ecosystem continues to rapidly evolve.
+
+* [The Hitchhiker’s Guide to Smart Contracts in Ethereum](https://blog.openzeppelin.com/the-hitchhikers-guide-to-smart-contracts-in-ethereum-848f08001f05) will help you get an overview of the various tools available for smart contract development, and help you set up your environment.
+* [A Gentle Introduction to Ethereum Programming, Part 1](https://blog.openzeppelin.com/a-gentle-introduction-to-ethereum-programming-part-1-783cc7796094) provides very useful information on an introductory level, including many basic concepts from the Ethereum platform.
+* For a more in-depth dive, you may read the guide [Designing the Architecture for Your Ethereum Application](https://blog.openzeppelin.com/designing-the-architecture-for-your-ethereum-application-9cec086f8317), which discusses how to better structure your application and its relationship to the real world.
 
 ## Security
 
-This project is maintained by [OpenZeppelin], and developed following our high standards for code quality and security. OpenZeppelin is meant to provide tested and community-audited code, but please use common sense when doing anything that deals with real money! We take no responsibility for your implementation decisions and any security problems you might experience.
+This project is maintained by [OpenZeppelin](https://openzeppelin.com), and developed following our high standards for code quality and security. OpenZeppelin is meant to provide tested and community-audited code, but please use common sense when doing anything that deals with real money! We take no responsibility for your implementation decisions and any security problems you might experience.
 
 The core development principles and strategies that OpenZeppelin is based on include: security in depth, simple and modular code, clarity-driven naming conventions, comprehensive unit testing, pre-and-post-condition sanity checks, code consistency, and regular audits.
 
@@ -46,20 +71,8 @@ Please report any security issues you find to security@openzeppelin.org.
 
 ## Contribute
 
-OpenZeppelin exists thanks to its contributors. There are many ways you can participate and help build high quality software. Check out the [contribution guide]!
+OpenZeppelin exists thanks to its contributors. There are many ways you can participate and help build high quality software. Check out the [contribution guide](CONTRIBUTING.md)!
 
 ## License
 
 OpenZeppelin is released under the [MIT License](LICENSE).
-
-
-[API docs]: https://docs.openzeppelin.com/contracts/api/token/erc20
-[guides]: https://docs.openzeppelin.com/contracts
-[API Stability]: https://docs.openzeppelin.com/contracts/releases-stability
-[forum]: https://forum.openzeppelin.com
-[OpenZeppelin]: https://openzeppelin.com
-[contribution guide]: CONTRIBUTING.md
-[OpenZeppelin CLI]: https://docs.openzeppelin.com/cli
-[Truffle]: https://truffleframework.com/docs/truffle/quickstart
-[Embark]: https://embark.status.im/docs/quick_start.html
-[Buidler]: https://buidler.dev/getting-started/#overview

docs/modules/ROOT/pages/index.adoc

@@ -28,10 +28,12 @@ Once installed, you can use the contracts in the library by importing them:
 ----
 pragma solidity ^0.5.0;
 
-import "@openzeppelin/contracts/ownership/Ownable.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721Full.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721Mintable.sol";
 
-contract MyContract is Ownable {
-  ...
+contract MyNFT is ERC721Full, ERC721Mintable {
+    constructor() ERC721Full("MyNFT", "MNFT") public {
+    }
 }
 ----