Update README

Author: Cuda-Chen

README.md

@@ -1,23 +1,28 @@
-[![][action-img]][action-url]
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+| **Build Status** | **Documentation** |
+| :---: | :---: |
+| [![][action-img]][action-url] | [![][docs-latest-img]][docs-latest-url] |
 
 # SeisPDF.jl
 Power Spectral Density Probability Density Functions Calculation
 described by [McNamara 2004](https://pubs.usgs.gov/of/2005/1438/).
 
 ## TO-DO
-- [ ] release workable version
+- [x] release workable version
     - [x] plot (using GMT.jl)
     - [x] integrate with [SeisIO](https://github.com/jpjones76/SeisIO.jl) data structure
     - [x] slide on actual timestamp range
 - [ ] GPU support
     - [ ] CUDA
     - [ ] AMD (optional)
 - [ ] enhancements
-    - [ ] docs
+    - [x] docs
     - [ ] swappable FFT libraries (e.g., kissFFT)
     - [ ] min, max, mode PDF
     - [ ] read high and low noise model into memory when importing
 
 <!-- URLS -->
 [action-img]: https://github.com/Cuda-Chen/SeisPDF.jl/workflows/CI/badge.svg
-[action-url]: https://github.com/Cuda-Chen/SeisPDF.jl/actions
+[action-url]: https://github.com/Cuda-Chen/SeisPDF.jl/actions/workflows/ci.yml
+[docs-latest-img]: https://github.com/Cuda-Chen/SeisPDF.jl/workflows/docs/badge.svg
+[docs-latest-url]: https://cuda-chen.github.io/SeisPDF.jl/