📝 Add installation instructions for GDAL

Author: akuzminykh

plugins/csl-ogc/README.md

@@ -1,4 +1,18 @@
 # OGC Web Services for CosmoScout VR
 
-Put the plugin library description here!
-```
+This plugin library provides tools to interact with OGC Web Services.
+
+## Installation
+
+This plugin uses [GDAL](https://gdal.org/en/stable/).
+
+### Linux
+
+TODO
+
+### Windows
+
+You can download GDAL binaries from the GISInternals Support Site.
+Get the [Development Kit](https://www.gisinternals.com/sdk.php) for your compiler and platform, e.g. MSVC 2022 and x64.
+After unpacking, set the environment variable `GDAL_ROOT_DIR` to the included release directory,
+e.g. `C:/release-1930-x64-dev/release-1930-x64`.

plugins/csp-visual-query/README.md

@@ -2,6 +2,11 @@
 
 Put the plugin description here!
 
+## Installation
+
+This plugin requires the [`csl-ogc`](../csl-ogc/README.md) plugin library.
+Please see its installation instructions.
+
 ## Configuration
 
 This plugin can be enabled with the following configuration in your `settings.json`.
@@ -16,4 +21,4 @@ The given values present some good starting values for your customization:
     }
   }
 }
-```
+```