Implement events for external use + Rename interfaces with a I prefix + add some documentation (#26)

Implement events for external use
Rename interfaces with a I prefix
Add some documentation

Co-authored-by: Eric NGUYEN <enguyen@techform.fr>
Reviewed-on: https://git.siklos-chaneru.duckdns.org/Siklos/svg-layout-designer-react/pulls/26

public/Interfaces.d.ts

@@ -0,0 +1,65 @@
+declare interface IHistoryState {
+  LastAction: string
+  MainContainer: IContainerModel
+  SelectedContainer: IContainerModel | null
+  SelectedContainerId: string
+  TypeCounters: Record<string, number>
+}
+
+declare interface IAvailableContainer {
+  Type: string
+  Width: number
+  Height: number
+  XPositionReference?: XPositionReference
+  Style: React.CSSProperties
+}
+
+declare interface IEditorState {
+  history: IHistoryState[]
+  historyCurrentStep: number
+  configuration: IConfiguration
+}
+
+declare interface IConfiguration {
+  AvailableContainers: IAvailableContainer[]
+  AvailableSymbols: IAvailableSymbol[]
+  MainContainer: IAvailableContainer
+}
+
+declare interface IContainerModel {
+  children: IContainerModel[]
+  parent: IContainerModel | null
+  properties: IProperties
+  userData: Record<string, string | number>
+}
+
+declare interface IProperties extends React.CSSProperties {
+  id: string
+  parentId: string | null
+  x: number
+  y: number
+  isRigidBody: boolean
+  XPositionReference?: XPositionReference
+}
+
+declare enum XPositionReference {
+  Left,
+  Center,
+  Right
+}
+
+declare interface IAvailableSymbol {
+  Name: string
+  XPositionReference: XPositionReference
+  Image: IImage
+  Width: number
+  Height: number
+}
+
+declare interface IImage {
+  Name: string
+  Url: string
+  Base64Image: string
+  Svg: string
+}
+