adapter/i_link_adapter library

1. flutter_mind_map package
2. documentation
3. adapter/i_link_adapter.dart

flutter_mind_map package

1. Libraries
2. adapter/i_link_adapter
3. adapter/i_node_adapter
4. adapter/i_theme_adapter
5. i_mind_map_node
6. link/beerse_line_link
7. link/i_link
8. link/line_link
9. link/poly_line_link
10. mind_map
11. mind_map_node
12. theme/i_mind_map_theme
13. theme/mind_map_theme_compact
14. theme/mind_map_theme_large
15. theme/mind_map_theme_normal