Update FAQ.md (#500)

* Update FAQ.md

Adding sequelize installation and create/remove seeders

* Update FAQ.md

* Update FAQ.md

Author: andres9366ha

FAQ.md

@@ -1,5 +1,10 @@
 The Sequelize Command Line Interface (CLI) Frequently Asked Question
 
+## Initialize sequelize to create necessary files in the project 
+```
+sequelize init
+```
+
 ## How can I generate a model?
 Specify model name with `--name` argument. List of table fields can be passed with `--attributes` option
 ``` 
@@ -11,7 +16,23 @@ $ sequelize model:create --name User --attributes name:string,state:boolean,birt
 sequelize db:migrate
 ```
 ## How can I make a migrations rollback?
-
 ```
 sequelize db:migrate:undo:all
 ```
+
+## How can I create a seeder?
+Specify seeder name with `--name` argument
+```
+sequelize seed:create --name <seeder_name> 
+```
+
+## How can I run the seeders?
+```
+sequelize db:seed:all
+```
+
+## How can I make the seeders rollback?
+```
+sequelize db:seed:undo:all
+```
+