Update installation docs

docs/getting-started.md

@@ -0,0 +1,14 @@
+# Getting started
+
+## Requirements
+
+SignalFlow supports macOS, Linux (including Raspberry Pi), and has alpha support for Windows. 
+
+## Installation
+
+ - [Installing SignalFlow on macOS](installation/macos.md)
+ - [Installing SignalFlow on Linux](installation/linux.md)
+
+## Examples
+
+[Several example scripts](https://github.com/ideoforms/signalflow/tree/master/examples/python) are included within the repo, covering simple control and modulation, FM synthesis, sample granulation, MIDI control, chaotic functions, etc.

docs/index.md

@@ -56,5 +56,5 @@ In subsequent examples, we will skip the `import` line and assume you have alrea
 
 ## Documentation
 
-- [Installation](installation/index)
+- [Installation](getting-started/)
 - [Example code](http://github.com/ideoforms/signalflow/tree/master/examples/python)