updated README.md

Author: jjykh

README.md

@@ -2,3 +2,35 @@
 Unified JavaScript API for scoring via various DL framework 
 
 Bagua is an ancient Chinese technique that can predict the future via looking back of the past, combined with many environmental arguments. This project is a JS framework with handy API for client side scoring/reference built on top of several existing DL/ML framework 
+
+# Install devtools
+
+  ```shell
+  npm -g install node-gyp
+  ```
+
+# bagua-caffe
+Caffe Backend
+
+## How to build bagua-caffe
+Build the code. Please follow [Caffe instruction](http://caffe.berkeleyvision.org/installation.html) to install all necessary packages and build it.
+
+  ```shell
+  # Modify Makefile.config according to your Caffe installation.
+
+  make -j8
+
+  # Build Node.js Addons
+
+  node-gyp configure build
+  ```
+
+## Demo
+Here we provided a SSD demo for object detection.
+
+1. Download [SSD300*](http://www.cs.unc.edu/~wliu/projects/SSD/models_VGGNet_VOC0712_SSD_300x300.tar.gz), and only extract the **caffemodel** file into model-zoo/caffe/VOC0712/SSD_300x300.
+
+2. cd demo/caffe-ssd && node demo.js
+
+
+