Add evolutions file

```
$ vim conf/evolutions/default/3.sql
$ vim conf/evolutions/default/4.sql
$ vim conf/evolutions/default/5.sql
```
Add Mention model & mention save

```
$ vim app/controllers/Application.scala
$ vim app/models/Mention.scala
```
Add signout action

```
$ vim app/controllers/Application.scala
$ vim conf/routes
```
Add bootstrap Library

```
$ vim build.sbt
```
Add public data
Add views

```
$ vim app/views/footer.scala.html
$ vim app/views/header.scala.html
$ vim app/views/idList.scala.html
$ vim app/view/index.scala.html
$ vim app/views/main.scala.html
```