feat: Posh.Host.UI.Box.GetBorderLine ( Fixes #373 )

docs/Posh/Host/UI/Box/GetBorderLine.md

@@ -0,0 +1,44 @@
+Posh.Host.UI.Box.GetBorderLine()
+--------------------------------
+
+### Synopsis
+Gets a border line
+
+---
+
+### Description
+
+Gets a single border line of a box.
+
+---
+
+### Parameters
+#### **LineType**
+The type of line.
+Valid Values:
+
+* Top
+* Bottom
+* Middle
+* Row
+
+|Type      |Required|Position|PipelineInput|
+|----------|--------|--------|-------------|
+|`[String]`|false   |1       |false        |
+
+#### **Width**
+The width of the border.  If no width is provided, will render a border the width of the screen.
+
+|Type     |Required|Position|PipelineInput|
+|---------|--------|--------|-------------|
+|`[Int32]`|false   |2       |false        |
+
+#### **ColumnWidth**
+The width of each column.
+If this is a decimal less than or equal to 1, it will be considered a percentage of $Width
+
+|Type        |Required|Position|PipelineInput|
+|------------|--------|--------|-------------|
+|`[Double[]]`|false   |3       |false        |
+
+---