Update README

README.md

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-# GNS3_patches
+# GNS3 Patches
 
-Custom patches for GNS3 network topology simulator & planning software.
+Custom patches for GNS3 network topology simulator & planning software.
+
+**Author**: Pekka Helenius, 2019-2021.
+
+## Patches
+
+### Link colors
+
+Adds link color support for GNS3.
+
+GNS3 version target: `2.2.0a2`
+
+[![](https://fjordtek.com/images/content/thumb/medium-550/gns3_1.png)](https://fjordtek.com/images/content/gns3_1.png)
+
+- [gns3-gui - patch_gns3gui_linkcolors.patch](patches/gns3-gui/patch_gns3gui_linkcolors.patch)
+
+- [gns3-server - patch_gns3server_linkcolors.patch](patches/gns3-server/patch_gns3server_linkcolors.patch)
+
+### QEMU environment variables
+
+GNS3 version target: `2.2.0a2`
+
+Adds QEMU environment variable support for GNS3. For instance, if we want to disable audio for QEMU-based virtual machines, simply give input variable `QEMU_AUDIO_DRV=none`.
+
+Internally, the supplied values are interpreted in Unix process level as `<qemu-envvars> <qemu-executable> <vm-parameters-by-gns3>`.
+
+![](images/patch_qemu-envvars-1.png)
+
+- [gns3-gui - patch_gns3gui_qemu-envvars.patch](patches/gns3-gui/patch_gns3gui_qemu-envvars.patch)
+
+- [gns3-server - patch_gns3server_qemu-envvars.patch](patches/gns3-server/patch_gns3server_qemu-envvars.patch)
+
+## License
+
+GPLv3.