[docs] Update configuration-ini.md file

[docs] Update configuration-ini.md file

- Remove learning_rate from oprimizer section
- Add learning rate scheduler section
- Remove dataset section
- Add train set, validation set and test set section
- Add many types to layer section
- Add table about type, key, value, default value and description for each layers
- Update configuration file example

**Self evaluation:**
1. Build test:   [X]Passed [ ]Failed [ ]Skipped
2. Run test:     [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Hyunil <hyunil46.park@samsung.com>