README: Update the README to explain how to get started

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

README.md

diff --git a/README.md b/README.md
index 3f7e7f8..36be4b0 100644
--- a/README.md
+++ b/README.md
@@ -28,35 +28,25 @@
 
 1.  Clone the repository:
 
-    ```bash
+    ```shell
     git clone https://github.com/tock/libtock-rs
     cd libtock-rs
     ```
 
-1.  Install `elf2tab`:
+1.  Install the dependencies:
 
-    ```bash
-    cargo install -f elf2tab --version 0.4.0
+    ```shell
+    make setup
     ```
 
-1.  Add dependencies for cross-compilation. Currently, only few platforms have been configured, e.g.:
+1.  Use `make` to compile and run an example app.
 
-    ```bash
-    rustup target add thumbv7em-none-eabi # For an nRF52 DK board
+    ```shell
+    make nrf52 # Builds all examples for the nrf52 platform
     ```
 
     ```bash
-    rustup target add riscv32imc-unknown-none-elf # For an OpenTitan board
-    ```
-
-1.  Use `cargo r<arch>` to compile and run an example app. The full command is platform dependent and looks as follows for the `blink` example:
-
-    ```bash
-    PLATFORM=nrf52 cargo rthumbv7em blink # For an nRF52 DK board
-    ```
-
-    ```bash
-    PLATFORM=opentitan cargo rriscv32imc blink # For an OpenTitan board
+    make opentitan # Builds all examples for the OpenTitan platform
     ```
 
     ```bash
@@ -91,8 +81,14 @@
 
 To run on the code on your board you can use
 
-```bash
-PLATFORM=<platform> cargo r<arch> <your_app> [--features=alloc]
+```shell
+make <platform> [FEATURES=alloc]
+```
+
+The example can also be flashed to the board by running:
+
+```shell
+make flash-<platform> EXAMPLE=<example>
 ```
 
 This script does the following steps for you:
@@ -101,11 +97,6 @@
 - create a TAB (tock application bundle)
 - if you have a J-Link compatible board connected: flash this TAB to your board (using tockloader)
 
-Instead of specifying an environment variable each time you can permanently configure your platform by writing its name into a file named `platform`, e.g.
-
-```bash
-echo nrf52 > platform
-```
 
 ## License