xmake: add page (#13217)

Co-authored-by: spageektti <git@spageektti.cc>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/xmake.md

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+# xmake
+
+> A cross-platform C & C++ build utility based on Lua.
+> More information: <https://xmake.io/#/getting_started>.
+
+- Create an Xmake C project, consisting of a hello world and `xmake.lua`:
+
+`xmake create --language c -P {{project_name}}`
+
+- Build and run an Xmake project:
+
+`xmake build run`
+
+- Run a compiled Xmake target directly:
+
+`xmake run {{target_name}}`
+
+- Configure a project's build targets:
+
+`xmake config --plat={{macosx|linux|iphoneos|...}} --arch={{x86_64|i386|arm64|...}} --mode={{debug|release}}`
+
+- Install the compiled target to a directory:
+
+`xmake install -o {{path/to/directory}}`