[ADF-4152] Updated folder structure of core docs (#4415)

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Manual fixes to core doc file links

* [ADF-4152] Further automatic + manual link tidying

docs/core/pipes/file-size.pipe.md

@@ -0,0 +1,29 @@
+---
+Title: File Size pipe
+Added: v2.0.0
+Status: Active
+Last reviewed: 2018-11-14
+---
+
+# [File Size pipe](../../../lib/core/pipes/file-size.pipe.ts "Defined in file-size.pipe.ts")
+
+Converts a number of bytes to the equivalent in KB, MB, etc.
+
+## Basic Usage
+
+<!-- {% raw %} -->
+
+```HTML
+<div>
+    File Size: {{ sizeInBytes | adfFileSize:"2" }}
+</div>
+```
+
+<!-- {% endraw %} -->
+
+## Details
+
+The pipe chooses the largest unit that is less than the total number of bytes and
+divides the total by this number. This ensures that the number of units is greater
+than 1 (eg, you will see "512 Bytes" rather than "0.5KB"). The pipe parameter indicates
+the number of decimal places to use for the value, defaulting to 2 decimal places.