Update readme

Author: costimuraru

README.md

@@ -6,13 +6,48 @@ Latest version is: 0.1.2
 
 ## Installation
 
+### Using `pip`
+
+```sh
+pip install hierarchical-yaml
+```
+
+### From Source
+
+```
+git clone https://github.com/adobe/hierarchical-yaml
+cd hierarchical-yaml
+sudo python setup.py install
+```
+
 ## Example
 
 ### Using the cli
+
+```sh
+usage: hyaml [-h] [--output-file OUTPUT_FILE] [--format OUTPUT_FORMAT]
+             [--filter FILTER] [--exclude EXCLUDE]
+             [--skip-interpolation-validation]
+             [--skip-interpolation-resolving] [--enclosing-key ENCLOSING_KEY]
+             [--cwd CWD]
+             path
+```
+
 ```sh
 hyaml examples/config_example/env=dev/region=us-east-1/cluster=cluster2
 ```
 
+The configuration output will be something like this:
+```
+cluster:
+  description: 'This is cluster: cluster2. It is using c3.2xlarge instance type.'
+  name: cluster2
+  node_type: c3.2xlarge
+region:
+  location: us-east-1
+env: dev
+```
+
 Where the examples folder looks something like this:
 ```
 $ tree examples/config_example