added rustup

sheets/rustup

@@ -0,0 +1,26 @@
+# rustup
+# The Rust toolchain installer 
+
+# update rustup toolchain
+rustup update
+
+# install nightly build
+rustup install nightly
+
+# use rustc from nightly toolchain
+rustup run nightly rustc --version
+
+# switch to nightly installation
+rustup default nightly
+
+# List all available targets for the active toolchain
+rustup target list
+
+# Install the Android target
+rustup target add arm-linux-androideabi
+
+# Run a shell configured for the nightly compiler
+rustup run nightly bash
+
+# Show which toolchain will be used in the current directory
+rustup show