Added Relevant error response per request

At the end of the API section
Updated the result codes table

removed the table that was added in previous update.
Removed topup result codes
Updated Get SEQR app

With new Payment Account screen and updated pdf-file.
Updated text for result code table
Updated Result codes table
added webm POS example
changed example for sendInvoice to contain acknowledgement mode
- removed unused error codes
moved the video in under references
Merge branch 'develop' of github.com:seqr-seamless/seqr-seamless.github.io into develop
Merge pull request #10 from SeamlessDistribution/master

Merge branch 'develop'
Merge pull request #11 from SeamlessDistribution/develop

Releasing