Add first batch of docs

website/docs/cmixx/_category_.json

website/docs/cmixx/adrp.md

website/docs/cmixx/cmixx.md

website/docs/cmixx/coverTraffic.md

website/docs/cmixx/e2e-xxm.md

website/docs/cmixx/idCollisionAndNotifications.md

website/docs/cmixx/userDiscovery.md

website/docs/cmixx/xxdk/_category_.json

website/docs/cmixx/xxdk/getting-started.md

website/docs/cmixx/xxdk/guides/_category_.json

website/docs/cmixx/xxdk/guides/cmix-client-keystore.md

website/docs/cmixx/xxdk/guides/ndf-retrieval.md

website/docs/cmixx/xxdk/mobile docs/_category_.json

website/docs/cmixx/xxdk/mobile docs/ios-sdk.md

website/docs/cmixx/xxdk/overview.md

website/docs/cmixx/xxdk/quick-reference.md

website/docs/cmixx/xxdk/technical-glossary.md

website/docs/dapps/_category_.json

website/docs/dapps/intro.md

website/docs/dapps/phoenixx.md