[LIB] Added some quick build instructions.

libavalonia.skia/CMakeLists.txt

@@ -4,7 +4,7 @@ project(avalonia.skia)
 find_package(PkgConfig)
 
 if(NOT PKGROOT)
-    set(PKGROOT ${CMAKE_SOURCE_DIR}/../pre-built/v0.1.1/x86_64-linux-gnu)
+    set(PKGROOT ${CMAKE_SOURCE_DIR}/pre-built)
 endif()
 
 set(ENV{PKG_CONFIG_PATH} ${PKGROOT}/usr/local/lib64/pkgconfig)

libavalonia.skia/README.md

@@ -0,0 +1,42 @@
+# Build
+
+Download the latest pre-built libskia from:
+https://github.com/AvaloniaUI/skiabuild/releases
+
+(Choose avalonia.skia-v0.3.0-linux-x86_64-linux-gnu-sysroot.tar.gz)
+
+Copy this to:
+
+```
+mkdir -p libavalonia.skia/pre-built/
+cp ~/Downloads/avalonia.skia-v0.3.0-linux-x86_64-linux-gnu-sysroot.tar.gz libavalonia.skia/pre-built/
+cd libavalonia.skia/pre-built
+tar xvf ./avalonia.skia-v0.3.0-linux-x86_64-linux-gnu-sysroot.tar.gz
+```
+
+Then build as usual:
+
+```
+cd libavalonia.skia
+mkdir build
+cd build
+
+cmake -GNinja ..
+ninja
+
+```
+
+
+This currently creates a test-program:
+
+```
+./avalonia.skia.testprog
+
+ls -la
+
+-rw-r--r-- 1 james james    10929 May  3 19:28 skia-c-example.png  
+
+md5sum ./skia-c-example.png
+8cb81a6c6ad6af7e01b274b879ca012c  ./skia-c-example.png  
+
+```