Cross Reference: /external/lz4/doc

`Name`	`Date`	`Size`
Up to higher level directory
`images/`	22-Oct-2020
`lz4_Block_format.md`	22-Oct-2020	`6K`
`lz4_Frame_format.md`	22-Oct-2020	`14K`
`lz4_manual.html`	22-Oct-2020	`23.5K`
`lz4frame_manual.html`	22-Oct-2020	`18.5K`