doc: extend README mentioning shorthand syntax with options

Author: SGSSGene

README.md

@@ -65,6 +65,7 @@ Afterwards, any targets defined in the dependency can be used directly.
 
 ```cmake
 CPMAddPackage(
+  URI           # shorthand including repo, name, version and tag (see shorthand syntax)
   NAME          # The unique name of the dependency (should be the exported target's name)
   VERSION       # The minimum version of the dependency (optional, defaults to 0)
   PATCHES       # Patch files to be applied sequentially using patch and PATCH_OPTIONS (optional)
@@ -88,7 +89,7 @@ If an additional optional parameter `SYSTEM` is set to a truthy value, the SYSTE
 See the [add_subdirectory ](https://cmake.org/cmake/help/latest/command/add_subdirectory.html?highlight=add_subdirectory)
 and [SYSTEM](https://cmake.org/cmake/help/latest/prop_tgt/SYSTEM.html#prop_tgt:SYSTEM) target property for details.
 
-A single-argument compact syntax is also supported:
+A shorthand syntax is also supported:
 
 ```cmake
 # A git package from a given uri with a version
@@ -112,6 +113,13 @@ CPMAddPackage("https://example.com/my-package-1.2.3.zip#MD5=68e20f674a48be38d60e
 CPMAddPackage("https://example.com/[email protected]")
 ```
 
+Additionally, the shorthand syntax can be used with the long version, using the `URI` specifier.
+```cmake
+CPMAddPackage(URI "gh:nlohmann/[email protected]"
+  OPTIONS "JSON_BuildTests OFF"
+)
+```
+
 After calling `CPMAddPackage`, the following variables are defined in the local scope, where `<dependency>` is the name of the dependency.
 
 - `<dependency>_SOURCE_DIR` is the path to the source of the dependency.