Ability to create full project structure using `bem create` command

Add techs that will add ability to run:

```sh
# create project directory
bem create -b my-project -T project

cd my-project/

# create desktop.blocks/ and desktop.bundles/ levels
bem create -b desktop -T blocks -T bundles

# create desktop.blocks/my-block/my-block.examples/ level
bem create -l desktop.blocks -b my-block -T examples

# create desktop.blocks/my-block/my-block.tech-docs/ level
bem create -l desktop.blocks -b my-block -T tech-docs

# create documentation for bemhtml as a set of documents (level)
bem create -l desktop.blocks/my-block/my-block.tech-docs -b bemhtml -T docs

# create documentation for js in md as a single file
bem create -l desktop.blocks/my-block/my-block.tech-docs -b js -T md
```