[Dev docs] How to develop with Texture (#1538)

docs/_docs/development/how-to-develop.md

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+title: How to start contributing to Texture
+layout: docs
+permalink: /development/how-to-develop.html
+---
+
+As an open source project, contributions are always welcome. Before you start, please read our <a href = "https://github.com/TextureGroup/Texture/blob/master/CONTRIBUTING.md">Contribution Guidelines</a>. It's also a good idea to familiarize yourself with our <a href = "overview.html">Development documentations</a>.
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+Setting up your dev environment:
+- If you don't have CocoaPods installed on your machine yet, you should <a href = "https://guides.cocoapods.org/using/getting-started.html#getting-started">install it</a> now.
+- Clone the framework's source code to your machine: `git clone [email protected]:TextureGroup/Texture.git` or `git clone https://github.com/TextureGroup/Texture.git`.
+- Run `pod install` in the directory that you cloned to.
+- Open "AsyncDisplayKit.xcworkspace" file CocoaPods has just generated. The workspace includes all the source code, as well as our test suite.
+- To run the test suite, make sure you select the same <a href = "https://github.com/TextureGroup/Texture/blob/32a2ebf49b797b0ba2a74f2af44457a9aa7b1160/build.sh#L3">device configuration we are using for our CI</a>, which is an iPhone 7 running iOS 10.2. This is important as our snapshot tests only have snapshots captured on such device configuration.
+- To run one of our sample projects, run `pod install` in the sample's directory and open the generated workspace.