Create safari-install.md

Author: sheepzh

safari-install.md

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+# How to install in Safari
+
+This is a too poor developer to pay $99 per year for distribution of an opensource and free browser extension in Apple App Store.
+So please intall it **manually**, GG Safari.
+
+## 0. Download this repository
+
+```shell
+git clone https://github.com/sheepzh/timer.git
+cd timer
+```
+
+## 1. Install tools
+
+Some tools are required to compile this project to an executable software for Safari.
+
+* [nodejs & npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
+* [Xcode (compitable for your version of macOS)](https://developer.apple.com/xcode/)
+
+## 2. Compile source code, install & run
+
+There are serveral steps.
+
+1. Compile the sourcecode programmed with TypeScript to js bundles.
+
+```shell
+# Install dependencies
+npm install
+# Compile
+npm run build:safari
+```
+Then there will be one folder called **Timer**.
+
+Also, you can download the archived file from [the release page](https://github.com/sheepzh/timer/releases), and unzip it to gain this folder.
+
+2. Convert js bundles to Xcode project
+
+```shell
+[YOUR_PATH]/Xcode.app/Contents/Developer/usr/bin/safari-web-extension-converter ./Timer
+```
+3. Run Xcode project and one extension app will installed on your macOS
+4. Enable this extension
+5. Finnally, open your Safari