docs: extend README.md page

- feature highlights
- contents page

Signed-off-by: David Scott <dave.scott@citrix.com>
docs: include the architecture diagrams

Signed-off-by: David Scott <dave.scott@citrix.com>
doc: describe diagram

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #10 from djs55/lots-of-docs

Add architecture diagram
doc: some typos in the main page

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #11 from djs55/lots-of-docs

doc: some typos in the main page
doc: Add placeholder pages for DR, HA, RPU

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #12 from djs55/lots-of-docs

doc: Add placeholder pages for DR, HA, RPU
docs: add some text on HA

Signed-off-by: David Scott <dave.scott@citrix.com>
docs: add some blurb about DR

Signed-off-by: David Scott <dave.scott@citrix.com>
docs: add some text on RPU

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #13 from djs55/lots-of-docs

Docs on HA, DR and RPU
docs: fix the main page a bit

Signed-off-by: David Scott <dave.scott@citrix.com>
docs: add text about XSM

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #14 from djs55/lots-of-docs

docs: more stuff
docs: add an empty list of designs

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #15 from djs55/lots-of-docs

docs: add an empty list of designs