README: add quick start and installation instructions

Signed-off-by: Daniel Maslowski <[email protected]>

Author: orangecms

README.md

@@ -10,12 +10,31 @@ Using flattened Docker images from <https://github.com/u-root/sidecore-images>,
 Building on top of [`cpu`](https://github.com/u-root/cpu), **sidecore** merely
 requires your IoT system to run a small daemon in order to use it as a resource.
 
-## Building
+## Build and run
 
 **NOTE**: Go version 1.20 is required as a minimum.
 
-Run `go build ./cmds/sidecore` to build the command.
+### Git repository
 
-## Usage
+If you have cloned this repository, run `go build ./cmds/sidecore` to build the
+command, then `./sidecore -h` for help.
 
-After building the command, run `./sidecore -h` for help.
+### Quick start
+
+To try out the command without explicitly cloning, run:
+
+```sh
+go run github.com/u-root/sidecore/cmds/sidecore@latest
+```
+
+### Installation
+
+To build the binary into your local Go bin directory, run:
+
+```sh
+go install github.com/u-root/sidecore/cmds/sidecore@latest
+```
+
+**NOTE**: Ensure to have that bin directory in your `$PATH` to run the resulting
+binary conveniently. For more details, look at the `go install` section in the
+[Go modules documentation](https://go.dev/ref/mod#go-install).