added osdialog example

projects/C/osdialog-example/.gitignore

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+# xmake
+.xmake/
+build/
+
+# 3rd party
+third/

projects/C/osdialog-example/README.md

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+https://github.com/AndrewBelt/osdialog.git

projects/C/osdialog-example/include/osdialog.h

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+../third/osdialog/osdialog.h

projects/C/osdialog-example/src/main.c

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+#include <stdio.h>
+
+#include "osdialog.h"
+
+int main(int argc, char const *argv[]) {
+  int res;
+
+  res = osdialog_message(OSDIALOG_INFO, OSDIALOG_OK, "Info こんにちは");
+  printf("Result: %d\n", res);
+
+  res = osdialog_message(OSDIALOG_WARNING, OSDIALOG_OK_CANCEL, "Warning こんにちは");
+  printf("Result: %d\n", res);
+
+  res = osdialog_message(OSDIALOG_ERROR, OSDIALOG_YES_NO, "Error こんにちは");
+  printf("Result: %d\n", res);
+
+  return 0;
+}

projects/C/osdialog-example/src/osdialog.c

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+../third/osdialog/osdialog.c

projects/C/osdialog-example/src/osdialog_zenity.c

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+../third/osdialog/osdialog_zenity.c

projects/C/osdialog-example/xmake.lua

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+set_project("osdialog-example")
+set_languages("c99")
+add_rules("mode.release")
+
+add_includedirs("include")
+
+target("osdialog-example")
+    set_kind("binary")
+    add_files("src/*.c")