Updated binary environment README (#773)

- Added usage instructions for getting started quickly.
- Added instructions for using the builder

environments/binary/README.md

@@ -4,22 +4,30 @@ The `binary` runtime is a go server that uses a subprocess to invoke executables
 
 Use Cases
 - Execute bash scripts
-- Run executables of languages that have no dedicated environment yet.
+- Execute arbitrary binaries (such as common sysadmin tools)
+- Get support in _any_ programming language by executing the generated executable.
 
-## Words of Caution
-The environment runs on an alpine image with some additional utilty commandline tools installed, such as 'grep'. 
-However, in case you want to make use of more ecsoteric commandline tools, you should add the relevant apk to the 
+⚠️ **Words of Caution** ⚠️
+
+The environment runs on an alpine image with some additional utility commandline tools installed, such as 'grep'. 
+However, in case you want to make use of more esoteric commandline tools, you should add the relevant apk to the 
 Dockerfile and build a new binary environment. See 'Compiling' for instructions.
 
 When executing functions using binaries, **ensure that the executable is built for the right architecture**. 
 Using the default binary environment this means that the binary should be build for Linux.
 
 ## Usage
+To get started with the latest binary environment:
+
+```bash
+fission env create --name binary --image fission/binary-env --builder fission/binary-builder
+```
+
 The interface to the executable used by this environment is somewhat similar to a [CGI interface](https://en.wikipedia.org/wiki/Common_Gateway_Interface).
 This means that any HTTP headers are converted to environment variables of the form "HTTP_<header-name>". For example these
 are some of frequently occurring headers:
 
-```
+```bash
 # Request Metadata
 CONTENT_LENGTH
 REQUEST_URI
@@ -28,18 +36,23 @@ REQUEST_METHOD
 # HTTP Headers
 HTTP_ACCEPT
 HTTP_USER-AGENT
-...
+HTTP_CONTENT-TYPE
+# ...
 ```
 
 The body of HTTP piped over the STDIN to the executable. 
 All output that is provided to the server over the STDOUT will be transformed into the HTTP response.
 
+See the [README](../../examples/binary/README.md) in the binary examples directory for additional usage instructions.
 
 ## Compiling
 
-Build the Dockerfile:
+To build the runtime environment:
 ```bash
 docker build --tag=${USER}/binary-env .
 ```
 
-See the [README](../../examples/binary/README.md) in the binary examples directory for usage instructions.
+To build the builder environment:
+```bash
+(cd builder/ && docker build --tag=${USER}/binary-builder .)
+```