[Improvement] Add tags for each README.md (open-mmlab#340)

Author: xvjiarui

configs/ann/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @inproceedings{annn,
   author    = {Zhen Zhu and

configs/apcnet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @InProceedings{He_2019_CVPR,
 author = {He, Junjun and Deng, Zhongying and Zhou, Lei and Wang, Yali and Qiao, Yu},

configs/ccnet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @article{huang2018ccnet,
     title={CCNet: Criss-Cross Attention for Semantic Segmentation},

configs/cgnet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latext
 @article{wu2018cgnet,
   title={CGNet: A Light-weight Context Guided Network for Semantic Segmentation},

configs/danet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @article{fu2018dual,
   title={Dual Attention Network for Scene Segmentation},

configs/deeplabv3/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latext
 @article{chen2017rethinking,
   title={Rethinking atrous convolution for semantic image segmentation},

configs/deeplabv3plus/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @inproceedings{deeplabv3plus2018,
   title={Encoder-Decoder with Atrous Separable Convolution for Semantic Image Segmentation},

configs/dmnet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @InProceedings{He_2019_ICCV,
 author = {He, Junjun and Deng, Zhongying and Qiao, Yu},

configs/dnlnet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 This example is to reproduce ["Disentangled Non-Local Neural Networks"](https://arxiv.org/abs/2006.06668) for semantic segmentation. It is still in progress.
 
 ## Citation

configs/emanet/README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+[ALGORITHM]
+
 ```latex
 @inproceedings{li2019expectation,
   title={Expectation-maximization attention networks for semantic segmentation},