Add status support

docs/input/status.md

@@ -0,0 +1,60 @@
+Title: Status
+Order: 6
+---
+
+Spectre.Console can display information about long running tasks in the console. 
+
+<img src="assets/images/status.gif" style="max-width: 100%;margin-bottom:20px;">
+
+If the current terminal isn't considered "interactive", such as when running 
+in a continuous integration system, or the terminal can't display 
+ANSI control sequence, any progress will be displayed in a simpler way.
+
+# Usage
+
+```csharp
+// Synchronous
+AnsiConsole.Status()
+    .Start("Thinking...", ctx => 
+    {
+        // Simulate some work
+        AnsiConsole.MarkupLine("Doing some work...");
+        Thread.Sleep(1000);
+        
+        // Update the status and spinner
+        ctx.Status("Thinking some more");
+        ctx.Spinner(Spinner.Known.Star);
+        ctx.SpinnerStyle(Style.Parse("green"));
+
+        // Simulate some work
+        AnsiConsole.MarkupLine("Doing some more work...");
+        Thread.Sleep(2000);
+    });
+```
+
+## Asynchronous progress
+
+If you prefer to use async/await, you can use `StartAsync` instead of `Start`.
+
+```csharp
+// Asynchronous
+await AnsiConsole.Status()
+    .StartAsync("Thinking...", async ctx => 
+    {
+        // Omitted
+    });
+```
+
+# Configure
+
+```csharp
+AnsiConsole.Status()
+    .AutoRefresh(false)
+    .Spinner(Spinner.Known.Star)
+    .SpinnerStyle(Style.Parse("green bold"))
+    .Start("Thinking...", ctx => 
+    {
+        // Omitted
+        ctx.Refresh();
+    });
+```