Add Linux issues section

Since there might be problems with certain setups

README.md

@@ -38,11 +38,16 @@ You can also download Windows release (an .exe file) from [Releases](https://git
 ## How to package
 `dotnet pack`
 
+## Linux issues
+You have to have **libgdiplus** in your system. Otherwise you will get following error
+> Unhandled exception. System.TypeInitializationException: The type initializer for 'Gdip' threw an exception.
+ ---> System.DllNotFoundException: Unable to load shared library 'libgdiplus' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibgdiplus: cannot open shared object file: No such file or directory
+
 ## Input files
-In theory System.Drawing.Bitmap should support BMP, GIF, EXIF, JPG, PNG and TIFF file formats. I have only tested it with PNG and JPG files.
+In theory System.Drawing.Bitmap should support BMP, GIF, EXIF, JPG, PNG and TIFF file formats. I have only tested it with PNG and JPG files.  
 
 ## Output files
-Output can be either PNG file(s) or HTML file with embedded PNG images. 
+Output can be either PNG file(s) or HTML file with embedded PNG images.  
 
 ## License
-Text in this document and source code files are released into the public domain. See [LICENSE](https://github.com/mcraiha/Dithery-cli/blob/master/LICENSE) file.
+Text in this document and source code files are released into the public domain. See [LICENSE](https://github.com/mcraiha/Dithery-cli/blob/master/LICENSE) file.