added some basic READMEs

INSTALL.md

@@ -2,6 +2,13 @@
 
 Mapnik runs on Linux, OS X, Windows, and BSD systems.
 
+## Package managers
+### vcpkg 
+To install mapnik with vcpkg type `vcpkg install mapnik`. It will install a minimal version of mapnik and all the needed dependencies. 
+To install more features, type `vcpkg search mapnik` to see all available features.
+
+## Source build
+
 First clone mapnik from github and initialize submodules
 
 ```bash

docs/cmake-usage.md

@@ -0,0 +1,34 @@
+# Usage with CMake
+## Build
+First clone mapnik from github and initialize submodules
+
+```bash
+git clone https://github.com/mapnik/mapnik.git
+cd mapnik
+git submodule update --init
+```
+
+Make sure that all dependencies are installed.
+
+All available cmake options are listed at the top of [CMakeLists.txt](../CMakeLists.txt). 
+Pass your options while configuring e.g.: `cmake -DBUILD_DEMO_VIEWER=OFF ..` to disable the build of the demo viewer application.
+
+To quickstart open a console in the root mapnik dir and execute the following commands: (Pass all options and dependency dirs after `-DBUILD_TEST=OFF`)
+```
+> cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DBUILD_TEST=OFF
+> cmake --build build --target install
+```
+
+## Usage
+
+To use Mapnik in your project add the following lines to your CMakeLists.tzt.
+```
+find_package(mapnik CONFIG REQUIRED)
+[...]
+target_link_libraries(mytarget ... mapnik::headers mapnik::mapnik)
+```
+
+All mapnik executables and targets are exported within `MapnikTargets.cmake`. 
+
+The plugin dir is available in the variable `MAPNIK_PLUGINS_DIR`. 
+The font path is is available in the variable `MAPNIK_FONTS_DIR`.