where: add page (#2223)

pages/windows/where.md

@@ -0,0 +1,20 @@
+# where
+
+> Display the location of files that match the search pattern.
+> Defaults to current work directory and paths in the PATH environment variable.
+
+- Display the location of file pattern:
+
+`where {{file_pattern}}`
+
+- Display the location of file pattern including file size and date:
+
+`where /T {{file_pattern}}`
+
+- Recursively search for file pattern at specified path:
+
+`where /R {{path/to/directory}} {{file_pattern}}`
+
+- Display only the error code for the location of file pattern:
+
+`where /Q {{file_pattern}}`