[PATCH libdrm] README: reflow the project description to improve readability

[Emil Velikov]

On Wed, 7 Nov 2018 at 18:02, Eric Engestrom <eric.engestrom at intel.com> wrote:
>
> Also, move the sentence about "who would use libdrm" into its own paragraph,
> as it is something people discovering libdrm will want to know.
>
> Signed-off-by: Eric Engestrom <eric.engestrom at intel.com>

Reviewed-by: Emil Velikov <emil.velikov at collabora.com>

-Emil