Add external link to app.solarperformanceinsight.org, outline Quickstart page

_data/navigation.yml

@@ -8,7 +8,7 @@
     link: /usecases/
 
 - name: Access the tool
-  link: /access/
+  href: https://app.solarperformanceinsight.org/
 
 - name: About
   links:

documentation/quickstart.md

@@ -0,0 +1,50 @@
+---
+layout: base
+permalink: /quickstart/
+sidebar: quickstart_sidebar.html
+title: Quickstart
+---
+
+{% include to_top.html %}
+
+
+The Solar Performance Insight tool provides both a [Dashboard](#dashboard) and an [API](#api).
+
+
+## Dashboard {#dashboard}
+{: .anchor}
+
+After logging in, the Dashboard guides you through the following steps:
+
+1. Define or select the [system] (#definesystem)
+2. Choose a workflow:
+   - [Calculate performance] (#calculateperformance)
+   - [Compare performance] (#compareperformance)
+
+## Systems {#system}
+{: .anchor}
+
+A PV system is defined by four sets of data:
+1. The performance model associated with the system. Options are [pvsyst-like](#pvsyst), [pvwatts](#pvwatts) and [SAM](#SAM).
+2. System metadata, including:
+   - name
+   - latitude and longitude. Use decimal degress (e.g., 35.5) without a direction character (e.g. N, E) and use negative longitude for locations west of the prime meridian.
+   - elevation above mean sea level in meters
+3. [Inverters] (#inverter). The options for inverter parameters depend on the performance model.
+4. [Arrays] (#array). An array is a collection of modules with the same fixed or tracking orientation. One or more arrays can be associated with each inverter. Array parameters depend on the performance model.
+
+### Pvsyst {#pvsyst}
+
+### PVWatts {#pvwatts}
+
+### SAM {#SAM}
+
+
+## Calculate performance {#calculateperformance}
+{: .anchor}
+
+## Compare performance {#calculateperformance}
+{: .anchor}
+
+## API {#api}
+{: .anchor}