add development guide.

README.md

@@ -28,10 +28,11 @@ To get started, please follow the [Installation Guide](https://github.com/Micros
 * [**Wiki**](https://github.com/Microsoft/LightGBM/wiki)
 * [**Installation Guide**](https://github.com/Microsoft/LightGBM/wiki/Installation-Guide)
 * [**Quick Start**](https://github.com/Microsoft/LightGBM/wiki/Quick-Start)
-* [**Examples**](./examples)
+* [**Examples**](https://github.com/Microsoft/LightGBM/tree/master/examples)
 * [**Features**](https://github.com/Microsoft/LightGBM/wiki/Features)
 * [**Parallel Learning Guide**](https://github.com/Microsoft/LightGBM/wiki/Parallel-Learning-Guide)
 * [**Configuration**](https://github.com/Microsoft/LightGBM/wiki/Configuration)
+* [**Document Indexer**](https://github.com/Microsoft/LightGBM/blob/master/docs/Readme.md)
 
 How to Contribute
 -----------------
@@ -41,7 +42,8 @@ LightGBM has been developed and used by many active community members. Your help
 - Check out [call for contributions](https://github.com/Microsoft/LightGBM/issues?q=is%3Aissue+is%3Aopen+label%3Acall-for-contribution) to see what can be improved, or open an issue if you want something.
 - Contribute to the [documents](https://github.com/Microsoft/LightGBM/tree/master/docs) to make it clearly for everyone.
 - Contribute to the [examples](https://github.com/Microsoft/LightGBM/tree/master/examples) to share your experience with other users.
-- Open issue if you met any problems during development.
+- Check out [Development Guide](./docs/development.md).
+- Open issue if you met problems during development.
 
 Microsoft Open Source Code of Conduct
 ------------

docs/Readme.md

@@ -2,7 +2,11 @@ Documents
 =========
 * [Installation Guide](https://github.com/Microsoft/LightGBM/wiki/Installation-Guide)
 * [Quick Start](./Quick-Start.md)
-* [Parameters](./Parameters.md) 
 * [Python Quick Start](./Python-intro.md)
+* [Features](https://github.com/Microsoft/LightGBM/wiki/Features)
+* [Experiments](https://github.com/Microsoft/LightGBM/wiki/Experiments) 
+* [Parameters](./Parameters.md) 
 * [Python API Reference](./Python-API.md)
 * [Parallel Learning Guide](https://github.com/Microsoft/LightGBM/wiki/Parallel-Learning-Guide)
+* [Development Guide](./development.md)
+

docs/development.md

+Development Guide
+==================
+
+Algorithms
+----------
+
+Refer to [Features](https://github.com/Microsoft/LightGBM/wiki/Features) to get important algorithms used in LightGBM.
+
+Classes And Code Structure 
+--------------------------
+
+### Important Classes
+
+| Class | description |
+| ----- | --------- |
+| `Application` | The entrance of application, including training and prediction logic |
+| `Bin` | Data structure used for store feature discrete values(converted from float values) | 
+| `Boosting` | Boosting interface, current implementation is GBDT and DART |
+| `Config` | Store parameters and configurations|
+| `Dataset` | Store information of dataset |
+| `DatasetLoader` | Used to construct dataset | 
+| `Feature` | Store One column feature |
+| `Metric` | Evaluation metrics |
+| `Network` | Newwork interfaces and communication algorithms |
+| `ObjectiveFunction` | Objective function used to train |
+| `Tree` | Store information of tree model |
+| `TreeLearner` | Used to learn trees | 
+
+### Code Structure
+
+| Path | description |
+| ----- | --------- |
+| ./include | header files |
+| ./include/utils | some common functions |
+| ./src/application | Implementations of training and prediction logic |
+| ./src/boosting | Implementations of Boosting |
+| ./src/io | Implementations of IO relatived classes, including  `Bin`, `Config`, `Dataset`, `DatasetLoader`, `Feature` and `Tree`|
+| ./src/metric | Implementations of metrics |
+| ./src/network | Implementations of network functions |
+| ./src/objective | Implementations of objective functions |
+| ./src/treelearner | Implementations of tree learners |
+
+### API Documents
+
+LightGBM support use [doxygen](http://www.stack.nl/~dimitri/doxygen/) to generate documents for classes and functions.
+
+C API
+-----
+Refere to the comments in [c_api.h](https://github.com/Microsoft/LightGBM/blob/master/include/LightGBM/c_api.h).
+
+High level Language package
+---------------------------
+
+Follow the implementation of [python-package](https://github.com/Microsoft/LightGBM/tree/master/python-package/lightgbm).
+
+Ask Questions
+-------------
+Feel free to open [issues](https://github.com/Microsoft/LightGBM/issues) if you met problems.
+
+
+