Minecrfat vanilla already has this. It's called a Ladder.
But what if you're stuck on a cliff, without anything to place a ladder on? Rope would be placeable without making a column of stone to get down and up.
Do some research friend, Not only has it already been suggested, there are multiple mods currently out there using rope. Examples - Betterthanwolves, DJoslin's Rope mod. and I know that there are more out there.
Crafting
Rope- 2 strings on each other
Swing- 4 rope and a wooden slab 2 rope on one end and the other. The slab in the middle.
Rope Ladder- Craft it the same way as a ladder.
But what if you're stuck on a cliff, without anything to place a ladder on? Rope would be placeable without making a column of stone to get down and up.
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