Add database for library

src-electron/database/readme.md

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+## Migrations
+In order to create a new migration, there is a some steps to go through.
+
+1. Run ``npm run migration:add --name <migration name>`` This currently work for Windows machines. If using Linux or Mac run this instead ``npx typeorm-ts-node-esm migration:generate ./src-electron/database/migrations/<migration name> -d ./src-electron/database/dataSource.ts``
+
+2. Go to ``./src-electron/database/dataSource.ts`` and add the newly 
+generated migration to the migrations array and entity variables. In that way it will automatically apply the latest changes to the database on startup.
+
+## The database
+A Sqlite database file is automatically created on startup named Library, it will be placed in the same directory as the executable.