feat(commands): more commands (#30)

- I wrote a scripts to copy and generate all commands missing in iris
from fig repo: https://github.com/withfig/autocomplete
- Add a new script to generate commands docs about which commands
currently are inside commands folder
377d4aac663590e504fe39a92eb4dac4cbd333b2
- Add more icons e64d4e70a1db61e62053460a882e093bd6373ab1

commands/fs/df.go

@@ -0,0 +1,22 @@
+package fs
+
+import (
+	"github.com/versenilvis/iris/commands/core"
+)
+
+func init() {
+	core.Register(&core.Spec{
+		Name:        "df",
+		Description: "Display free disk space",
+		Options: []core.Option{
+			{Name: "-a", Description: "Show all mount points"},
+			{Name: "-b", Description: "Use 512-byte blocks (default)"},
+			{Name: "-g", Description: "Use 1073741824-byte (1-Gbyte) blocks"},
+			{Name: "-m", Description: "Use 1048576-byte (1-Mbyte) blocks"},
+			{Name: "-k", Description: "Use 1024-byte (1-Kbyte) blocks"},
+			{Name: "-H", Description: "Include the number of free inodes"},
+			{Name: "-l", Description: "Only display information about locally-mounted filesystems"},
+			{Name: "-n", Description: "Print out the previously obtained statistics"},
+		},
+	})
+}