- initial work on backend side

server/backend/README.md

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+The idea is to keep server simple as much as possible.
+
+This will serve as central endpoint to provide API.
+
+- list all available devices for the user.
+- list all upcoming changes starting from given datetime excluding some device(s).
+- put new change to backend.
+
+Type of changes:
+
+- import: initial import of texts
+- text diff
+- branch operation - add / delete / move / rename
+- new time intervals
+- delete time intervals
+
+All data is encrypted. Server hasn't access to changes content. Changes are treated as BLOBs.
+

server/sql/database.sql

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+CREATE DATABASE IF NOT EXISTS litt CHARACTER SET utf8 COLLATE utf8_general_ci;
+
+CREATE TABLE diffs (  client_id              int not null,
+                      device_id              varchar(255) not null,  
+                      created                timestamp not null,
+                      content                blob not null );
+
+create table clients ( client_id             int not null,
+                       username              varchar(255) not null,
+                       password              varchar(255) not null);
+                       
+create table devices ( client_id             int not null,
+                       device_id             int not null,
+                       device_name           varchar(255) not null,
+                       device_platform       int not null);
+                       
+
+