(#76) Document the changes

CHANGELOG.md

@@ -20,6 +20,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - `AbsolutePath::Canonicalize` to convert the path to absolute, convert to correct case on case-insensitive file systems, resolve symlinks.
 
   Thanks to @Kataane.
+- [#76](https://github.com/ForNeVeR/TruePath/issues/76): a new `Temporary` class for creating a temp file or folder.
+
+  Thanks to @Illusion4.
 
 ## [1.3.0] - 2024-06-21
 ### Added

README.md

@@ -87,6 +87,13 @@ Aside from the strict types, the following features are supported for the paths:
 
     (Note how `GetFileNameWithoutExtension()` works nicely together with `GetExtensionWithDot()` to reconstruct the resulting path from their concatenation, however weird the initial name was — no extension, trailing dot, no base name.)
 
+### `Temporary`
+
+`TruePath.Temporary` class contains a set of utility methods to work with the system temp directory (most widely known as `TEMP` or `TMP` environment variable):
+- `Temporary::SystemTempDirectory()` will return it as an absolute path;
+- `Temporary::CreateTempFile()` will create a randomly-named file in the system temp directory and return an absolute path to it;
+- `Temporary::CreateTempFolder()` will create a randomly-named folder in the system temp directory and return an absolute path to it.
+
 Documentation
 -------------
 - [Contributor Guide][docs.contributing]