lvcreate: add page (#1270)

* lvcreate: add page

* fix lint errors

* adding short description of volume group

* Simplify volume group description

pages/linux/lvcreate.md

@@ -0,0 +1,20 @@
+# lvcreate
+
+> Creates a logical volume in an existing volume group.
+> A volume group is a collection of logical and physical volumes.
+
+- Create a logical volume of 10 gigabytes in the volume group vg1:
+
+`lvcreate -L {{10G}} {{vg1}}`
+
+- Create a 1500 megabyte linear logical volume named mylv in the volume group vg1:
+
+`lvcreate -L {{1500}} -n {{mylv}} {{vg1}}`
+
+- Create a logical volume called mylv that uses 60% of the total space in volume group vg1:
+
+`lvcreate -l {{60%VG}} -n {{mylv}} {{vg1}}`
+
+- Create a logical volume called mylv that uses all of the unallocated space in the volume group vg1:
+
+`lvcreate -l {{100%FREE}} -n {{mylv}} {{vg1}}`