add readme

Author: Spritea

README.md

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+# Context Aggregation Network
+This is the official implementation code of paper `Context aggregation network for semantic labeling in aerial images`.
+## Requirements
+* pytorch>=0.4
+* [pytorch-semseg](https://github.com/meetshah1995/pytorch-semseg)
+
+## Getting started
+1. Clone pytorch-semseg repo.
+2. Put `CAN.py` in the folder `pytorch-semseg/ptsemseg/models`
+3. Change `pytorch-semseg/ptsemseg/models/__init__.py` correspondingly.
+4. Add your own config file to `pytorch-semseg/configs` folder.
+5. Add your own dataloader file to `pytorch-semseg/ptsemseg/loader` folder. 
+6. Change `pytorch-semseg/ptsemseg/loader/__init__.py` correspondingly.
+7. Run `train.py` by following the specific orders in `pytorch-semseg` repo.
+## Dependency
+This repo is heavily based on the framework provided by [pytorch-semseg](https://github.com/meetshah1995/pytorch-semseg).