Added a very basic class diagram

docs/dev.org

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+#+TITLE: Fejlesztői Dokumentáció
+
+* TODO Követelmények
+* TODO Use-cas-ek
+* TODO Struktúrális leírás
+** Osztály diagram
+
+#+BEGIN_SRC plantuml :file class-diagram.png :exports result
+@startuml
+Exchange <|--- Binance
+Market <--- "-currencies" Currency : 2
+Exchange *--- " #markets" Market : 1..*
+Trader <--- "-exchanges" Exchange: 1..*
+TradeTracker *--- "-traders" Trader: 0..*
+
+class TradeTracker {
+   -round()
+   +start()
+}
+
+abstract class Trader {
+   +{abstract} step()
+}
+
+note right of Trader::step()
+  Itt történik a trader belső logikája
+end note
+
+abstract class Exchange {
+  -String name
+  +getName(): String
+  +{abstract} updateAllMarkets()
+  +{abstract} updateMarket(id: int)
+  +{abstract} updateMarket(name : String)
+  +getMarket(id: int): Market
+  +getMarket(name: String): Market
+  +{abstract} addMarket(m: Market)
+}
+
+class Binance {
+  -{static} String baseURL
+  +updateMarket(id: int)
+  +updateMarket(name : String) 
+  +updateMarkets()
+}
+
+note left of Binance
+  Ez csak egy példa, lehetne akár más is
+end note
+
+class Market {
+  -String name
+  -double exchange_rate
+  +Market(primary: Currency,secondary: Currency)
+  +getName(): String
+  +getExchangeRate(): double
+  +setExchangeRate(d: double)
+}
+
+class Currency {
+  -String name
+  -String symbol
+  +Currency(name: String,symbol: String)
+  +getName() : String
+  +getSymbol() : String
+}
+@enduml
+#+END_SRC
+
+#+RESULTS:
+[[file:class-diagram.png]]
+* TODO Viselkedés leírása