add toc to documentation

README.md

@@ -38,6 +38,61 @@ go get -u github.com/jinzhu/gorm
 installing the package by using the GoDoc page at:
 http://godoc.org/github.com/jinzhu/gorm
 
+## Table of Contents
+
+- [Define Models (Structs)](#define-models-structs)
+- [Conventions](#conventions)
+- [Initialize Database](#initialize-database)
+- [Migration](#migration)
+- [Basic CRUD](#basic-crud)
+	- [Create Record](#create-record)
+	- [Query](#query)
+	- [Query With Where (Plain SQL)](#query-with-where-plain-sql)
+	- [Query With Where (Struct & Map)](#query-with-where-struct--map)
+	- [Query With Not](#query-with-not)
+	- [Query With Inline Condition](#query-with-inline-condition)
+	- [Query With Or](#query-with-or)
+	- [Query Chains](#query-chains)
+	- [Preloading (Eager loading)](#preloading-eager-loading)
+- [Update](#update)
+    - [Update Without Callbacks](#update-without-callbacks)
+    - [Batch Updates](#batch-updates)
+    - [Update with SQL Expression](#update-with-sql-expression)
+- [Delete](#delete)
+    - [Batch Delete](#batch-delete)
+    - [Soft Delete](#soft-delete)
+- [Associations](#associations)
+    - [Has One](#has-one)
+    - [Belongs To](#belongs-to)
+    - [Has Many](#has-many)
+    - [Many To Many](#many-to-many)
+    - [Polymorphism](#polymorphism)
+- [Advanced Usage](#advanced-usage)
+	- [FirstOrInit](#firstorinit)
+	- [FirstOrCreate](#firstorcreate)
+	- [Select](#select)
+	- [Order](#order)
+	- [Limit](#limit)
+	- [Offset](#offset)
+	- [Count](#count)
+	- [Pluck](#pluck)
+	- [Raw SQL](#raw-sql)
+	- [Row & Rows](#row--rows)
+	- [Scan](#scan)
+	- [Group & Having](#group--having)
+	- [Joins](#joins)
+	- [Transactions](#transactions)
+	- [Scopes](#scopes)
+	- [Callbacks](#callbacks)
+	- [Specifying The Table Name](#specifying-the-table-name)
+	- [Error Handling](#error-handling)
+	- [Logger](#logger)
+	- [Existing Schema](#existing-schema)
+	- [Composite Primary Key](#composite-primary-key)
+	- [Database Indexes & Foreign Key](#database-indexes--foreign-key)
+	- [Default values](#default-values)
+	- [More examples with query chain](#more-examples-with-query-chain)
+
 ## Define Models (Structs)
 
 ```go