nlohmann-json: Add recipe

nlohmann-json is a c++ header-only json library.

Signed-off-by: James Feist <james.feist@linux.intel.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/nlohmann-json/nlohmann-json_git.bb

@@ -0,0 +1,23 @@
+SUMMARY = "JSON for modern C++"
+HOMEPAGE = "https://nlohmann.github.io/json/"
+SECTION = "libs"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://LICENSE.MIT;md5=9a8ae1c2d606c432a2aa2e2de15be22a"
+
+SRC_URI = "git://github.com/nlohmann/json.git"
+
+PV = "3.2.0+git${SRCPV}"
+
+SRCREV = "8c20571136f2d5351b379a06ad6591bd980880fe"
+
+S = "${WORKDIR}/git"
+
+inherit cmake
+
+EXTRA_OECMAKE += "-DJSON_BuildTests=OFF"
+
+# nlohmann-json is a header only C++ library, so the main package will be empty.
+
+RDEPENDS_${PN}-dev = ""
+
+BBCLASSEXTEND = "native nativesdk"