fix #1: add readme for project setup

README.md

@@ -0,0 +1,20 @@
+# ~/amphineko
+
+This repository is a development copy of my homepage ([https://futa.moe/amphineko/](https://futa.moe/amphineko/)), which can be used as a template.
+
+Text contents are mainly located at `index.html`. To replace the texts and the picture (`amphineko.png`), can be easily done by editing this file. 
+
+For futuremore modification, including color settings and layouts, check SASS files in `assets/stylesheets`. Don't forget `gulp`-ing to rebuild SASS files and reflect your modification.
+
+## build
+
+To build this repository, run these following commands:
+
+```
+npm install .
+npm run build
+```
+
+You may check your `NODE_ENV` before executing `npm install .` to ensure `devDependencies` are installed.
+
+`install` might be pretty hard for Windows users who have poor connections to GitHub (for some well-known reasons), while `npm` is trying to fetch `node-sass-binaries` on GitHub.