text: Title: Adding Binance / Other Exchanges
  Body: An issue to collect data and tasks needed for adding binance
  
  - [x] Decrease Callback/ Load Amount to 1 in #40
  - [x]  Analyze compatibility
  Needed changes in Data call?
  Needed changes in Data storage (Multiple times same pair e.g. "ETH-USD")
  
  - [x]  Discuss form of presentation
  Original:Send all data to client, and hide/ show selection on clientside with js?
  **Update**: Sending all data should be no problem due to changes in #40 
  Maybe rework show/ hide in the future, to show/ hide complete exchanges.
  
  - [ ]  Add Dropdown to select exchange
  **Update** Show/ Hide Button is much easier
  
  - [ ] define format for get_data function 
  Goal is to keep get_data modular for future.
  
  - [ ] exclude api calls from get_data function 
  
  
  When we change this we should change #28 aswell
  
  
  
  Thanks and Greets
  
  Theimo