fdisk: add page (#2014)

pages/linux/fdisk.md

@@ -0,0 +1,11 @@
+# fdisk
+
+> A program for managing partition tables and partitions on a hard disk.
+
+- List partitions:
+
+`fdisk -l`
+
+- Start the partition manipulator:
+
+`fdisk {{/dev/sda}}`