add termcolor (#1678)

* add termcolor

* fix indent

* fix termcolor hash

packages/t/termcolor/xmake.lua

@@ -0,0 +1,23 @@
+package("termcolor")
+    set_kind("library", { headeronly = true })
+    set_homepage("https://github.com/ikalnytskyi/termcolor")
+    set_description("Termcolor is a header-only C++ library for printing colored messages to the terminal. Written just for fun with a help of the Force.")
+    set_license("BSD-3-Clause")
+
+    add_urls("https://github.com/ikalnytskyi/termcolor/archive/refs/tags/v$(version).zip",
+        "https://github.com/ikalnytskyi/termcolor.git")
+    add_versions("2.1.0", "7b13b2adea95d9abfbbf7e7843da57136e81e806de35f4efe79a832a2bbaf56b")
+
+    on_install(function(package)
+        os.cp("include/termcolor/termcolor.hpp", package:installdir("include/termcolor"))
+    end)
+
+    on_test(function(package)
+        assert(package:check_cxxsnippets({ test = [[
+        void test() {
+            std::cout << termcolor::red
+                << "Hello World!"
+                << termcolor::reset;
+        }
+        ]] }, { includes = "termcolor/termcolor.hpp" }))
+    end)