Update readme, put example in example dir

recipes-example/rust-hello-world/rust-hello-world_git.bb

@@ -0,0 +1,21 @@
+SRC_URI = "git://github.com/jmesmon/rust-hello-world.git;protocol=https"
+SRCREV="e0fa23f1a3cb1eb1407165bd2fc36d2f6e6ad728"
+LIC_FILES_CHKSUM="file://COPYRIGHT;md5=e6b2207ac3740d2d01141c49208c2147"
+
+SUMMARY = "Hello World by Cargo for Rust"
+HOMEPAGE = "https://github.com/jmesmon/rust-hello-world"
+LICENSE = "MIT | Apache-2.0"
+
+DEPENDS = "cargo-native"
+
+inherit rust
+S = "${WORKDIR}/git"
+B = "${S}"
+
+do_compile () {
+	oe_runcargo_build
+}
+
+do_install () {
+	cp ${WORKDIR}/target/* ${D}${bindir}
+}