Note: Kindly install Tortois SVN from the below link

http://tortoisesvn.net/downloads.html

1  Go to Force.com IDE workspace folder.

2. Find the folder for the organization you want to add the folder to and open it.

3. Create a folder in the root.

4. Move the documents to this folder.

5. Right click on the new folder and in the Tortoise menu click ADD

6. Right click on the new folder and in the Tortoise menu click SVN Commit.

Cheers!!!