Add Japanese "Getting started - OpenStack" page for LXD

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Add Japanese REST API page for LXD

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Add Japanese contribute page for LXD

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Add Japanese articles page for LXD

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Merge pull request #22 from tenforward/japanese

Add some Japanese pages for LXD