adding roscpp-core recipe that shows how to turn a metapackage into a bitbake recipe

recipes-ros/roscpp-core/roscpp-core_0.3.12.bb

+DESCRIPTION = "Underlying data libraries for roscpp messages"
+SECTION = "devel"
+LICENSE = "BSD & LGPL"
+LIC_FILES_CHKSUM = "file://package.xml;beginline=8;endline=9;md5=20ce6a31158ec69f9cec7df32db0676f"
+
+SRC_URI = "https://github.com/ros-gbp/roscpp_core-release/archive/release/roscpp_core/0.3.12.tar.gz;downloadfilename=roscpp-cppcore_0.3.12.tar.gz"
+SRC_URI[md5sum] = "56cfd5b11cba6d28f742106a1eeafc92"
+SRC_URI[sha256sum] = "b9ed9dadb21430deb87d56f4051da80238a36feea972ec0d3cecbfe91bb42d84"
+
+S = "${WORKDIR}/roscpp_core-release-release-roscpp_core-0.3.12"
+
+RDEPENDS_${PN} = "\
+  ros-cpp-common \
+  roscpp-serialization \
+  roscpp-traits \
+  rostime \
+"
+
+FILES_${PN} = ""
+FILES_${PN}-dev = ""
+