Added premake5 build configuration with projects for Windows & Mac.

- updated .gitignore with the .projects / .artifacts directories.

.gitignore

@@ -7,6 +7,8 @@ tinyxml2/tinyxml2-cbp/bin/
 tinyxml2/tinyxml2-cbp/obj/
 tinyxml2/bin/
 tinyxml2/temp/
+.artifacts/
+.projects/
 *.sdf
 *.suo
 *.opensdf
@@ -15,4 +17,4 @@ tinyxml2/temp/
 *.layout
 *.o
 *.vc.db
-*.vc.opendb
+*.vc.opendb

premake5.lua

@@ -0,0 +1,95 @@
+--
+-- Requires: Premake 5 (https://premake.github.io/)
+-- Usage: premake5 --file=premake5.lua [project / makefile format, refer to premake5 --help] --target=[target from below]
+--
+
+-- target option
+tbl_target_values =
+{
+	{ "windows", "VS2015 projects targeting Windows 32/64 bits" },
+	{ "macosx", "Xcode4 projects targeting OS X" },
+}
+
+newoption
+{
+	trigger = "target",
+	description = "Build environment and target to generate projects for.",
+	allowed = tbl_target_values
+}
+
+-- validation
+target_env = _OPTIONS["target"]
+if not target_env then
+	print "Command-line option --target is required with one of the following values:"
+	for _, v in ipairs(tbl_target_values) do
+		print(v[1])
+	end
+	os.exit(1)
+end
+
+-- solution
+workspace "tinyxml2"
+
+	tbl_platforms = {}
+    if target_env == "windows" then
+        tbl_platforms = {
+            "x86",
+            "x64",
+        }
+    elseif target_env == "macosx" then
+        tbl_platforms = {
+            "Universal64"
+        }
+    end
+	platforms(tbl_platforms)
+
+	tbl_configurations = {
+		"Debug",
+		"Release",
+	}
+	configurations(tbl_configurations)
+
+	sln_location = ".projects/"..target_env
+	location(sln_location)
+
+	bin_location = ".artifacts/"..target_env
+	obj_location = ".intermediate/"..target_env
+
+	for _, p in ipairs(tbl_platforms) do
+		for _, c in ipairs(tbl_configurations) do
+			local pc = p.."-"..c
+			filter{ "platforms:"..p, c }
+				targetdir(bin_location.."/"..pc)
+				libdirs(bin_location.."/"..pc)
+				objdir(obj_location.."/"..pc)
+		end
+	end
+
+	filter("not Release")
+		optimize "Debug"
+		symbols "On"
+	filter{ "Release" }
+		optimize "Full"
+	filter{}
+
+	-- projects
+	project "tinyxml2"
+
+		kind "staticlib"
+
+		files {
+			"tinyxml2.h",
+			"tinyxml2.cpp"
+		}
+
+	project "xmltest"
+
+		kind "consoleapp"
+
+		links {
+			"tinyxml2"
+		}
+
+		files {
+		    "xmltest.cpp"
+        }