Update README.md

README.md

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-# range-gen
+# Range-Gen
+
+![build release](https://github.com/GenZmeY/range-gen/workflows/build%20release/badge.svg)
+[![GitHub top language](https://img.shields.io/github/languages/top/GenZmeY/range-gen)](https://golang.org)
+[![GitHub](https://img.shields.io/github/license/GenZmeY/range-gen)](https://www.gnu.org/licenses/gpl-3.0.en.html)
+[![GitHub release (latest by date)](https://img.shields.io/github/v/release/genzmey/range-gen)](https://github.com/GenZmeY/range-gen/releases)
+
+*range-gen creates a list of scene ranges based on a set of frames from the video. This program is used in the [video2d-2x](https://github.com/GenZmeY/video2d-2x) project.*
+
+***
+
+# Build & Install
+**Note:** You can get the compiled version for your platform on the [release page](https://github.com/GenZmeY/range-gen/releases).
+
+Dependencies:  
+- linux distro
+- git
+- golang 1.13
+- make  
+
+Get the source:  
+`git clone https://github.com/GenZmeY/range-gen`  
+
+Build:  
+`cd range-gen && make`  
+
+Install:  
+`make install`  
+
+**Build versions for all plaforms:**  
+`make -j $(nproc) compile`  
+(executables will be in `range-gen/bin` folder)
+
+# Usage
+```
+Usage: range-gen [option]... <input_dir> <output_file> <threshold>
+input_dir          Directory with png images
+output_file        Range list file
+threshold          Image similarity threshold (0-1024)
+
+Options:
+  -j, --jobs N     Allow N jobs at once
+  -n, --noise      Default noise level for each range (0-3)
+  -h, --help       Show this page
+  -v, --version    Show version
+```
+
+# License
+Range-gen is licensed under the [GNU GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html), but uses a [go-perceptualhash](https://github.com/dsoprea/go-perceptualhash) ([BSD 3-Clause License](https://github.com/dsoprea/go-perceptualhash/blob/master/LICENSE)) to calculate hashes of images.