Update README.md

README.md

@@ -1,5 +1,9 @@
 # Uplot
 
+Create ASCII charts on the terminal with data from standard streams in the pipeline. 
+
+:bar_chart: Powered by [UnicodePlot](https://github.com/kojix2/uplot)
+
 :construction: Under development
 
 ## Installation
@@ -10,12 +14,39 @@ gem install uplot
 
 ## Usage
 
+### histogram
+
+```sh
+ruby -r numo/narray -e "puts Numo::DFloat.new(1000).rand_norm.to_a" \
+  | uplot hist --nbins 15
+```
+
+```
+                ┌                                        ┐ 
+   [-4.5, -4.0) ┤ 1                                        
+   [-4.0, -3.5) ┤ 0                                        
+   [-3.5, -3.0) ┤ 1                                        
+   [-3.0, -2.5) ┤▇▇ 9                                      
+   [-2.5, -2.0) ┤▇▇▇ 15                                    
+   [-2.0, -1.5) ┤▇▇▇▇▇▇▇▇▇ 50                              
+   [-1.5, -1.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 97                     
+   [-1.0, -0.5) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 154          
+   [-0.5,  0.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 193   
+   [ 0.0,  0.5) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 165        
+   [ 0.5,  1.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 152          
+   [ 1.0,  1.5) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 86                       
+   [ 1.5,  2.0) ┤▇▇▇▇▇▇▇▇▇ 51                              
+   [ 2.0,  2.5) ┤▇▇▇▇ 21                                   
+   [ 2.5,  3.0) ┤▇ 3                                       
+   [ 3.0,  3.5) ┤ 2                                        
+                └                                        ┘ 
+                                Frequency
+```
+
 ## Development
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/uplot.
-
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).