more tutorial

examples/tutorial/hello/rust/README.md

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+# Using rust with functions
+
+The easiest way to create a function in rust is via ***cargo*** and ***fn***.
+
+## Prerequisites
+
+First create an epty rust project as follows:
+
+```bash
+cargo init --name func --bin
+```
+
+Make sure the project name is ***func*** and is of type ***bin***. Now just edit your code, once done you can create a function.
+
+## Creating a function
+
+Simply run
+
+```bash
+fn init --runtime=rust <username>/<funcname>
+```
+
+This will create the ```func.yaml``` file required by functions, which can be built by running:
+
+```bash
+fn build
+```
+
+## Testing
+
+```bash
+fn run
+```