Add CONTRIBUTING.md

CONTRIBUTING.md

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+# How to Contribute
+
+## Bug Report
+
+- Do a search on GitHub under Issues in case it has already been reported
+- Submit __executable script__ or failing test pull request that could demonstrates the issue is *MUST HAVE*
+
+## Feature Request
+
+- Feature request with pull request is welcome
+- Or it won't be implemented until I (other developers) find it is helpful for my (their) daily work
+
+## Pull Request
+
+- Prefer single commit pull request, that make the git history can be a bit easier to follow.
+- New features need to be covered with tests to make sure your code works as expected, and won't be broken by others in future
+
+## Contributing to Documentation
+
+- You are welcome ;)
+- You can help improve the README by making them more coherent, consistent or readable, and add more godoc documents to make people easier to follow.
+- Blogs & Usage Guides & PPT also welcome, please add them to https://github.com/jinzhu/gorm/wiki/Guides
+
+### Executable script template
+
+```go
+package main
+
+import (
+    _ "github.com/mattn/go-sqlite3"
+    _ "github.com/go-sql-driver/mysql"
+    _ "github.com/lib/pq"
+    "github.com/jinzhu/gorm"
+)
+
+var db gorm.DB
+
+func init() {
+    var err error
+    db, err = gorm.Open("sqlite3", "test.db")
+    // db, err := gorm.Open("postgres", "user=username dbname=password sslmode=disable")
+    // db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True")
+    if err != nil {
+        panic(err)
+    }
+    db.LogMode(true)
+}
+
+func main() {
+    // Your code
+}
+```