added a self-developed 3x3 rubiks cube solution.

Author: simulatedScience

version_2_3_v-tables_HER/src/puzzles/rubiks_cube/my_solution.md

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+
+## Algorithms
+
+### Swap two corners
+
+This algorithm swaps the upper front two corners while also changing four edge pieces.
+
+r r t d' r r t' r r d r r d' r r d r r t'  
+= r2 t d' r2 t' r2 d r2 d' r2 d r2 t'
+
+Order: 4
+
+### Flip two edges
+
+Flip the upper front and upper back edges in-place without changing any other pieces.
+
+slice_y t slice_y t slice_y t slice_y t slice_y' t' slice_y' t' slice_y' t' slice_y' t'  
+= 4*(slice_y t) 4*(slice_y' t')
+
+Order: 2
+
+### cycle three edges counterclockwise
+
+Cycle the upper front, upper right, and upper back edges counterclockwise without changing any other pieces and without flipping them.
+
+2*(r r t r r t r r t t r r t t)  
+= 2*(r2 t r2 t r2 t2 r2 t2)  
+= 2*(r2 t) 2*(r2 t2)
+
+Order: 3
+
+### Cycle three corners counterclockwise
+
+Cycle all upper corners but the front right one counterclockwise without changing any other pieces. This also rotates each corner arount its axis through the COM 120° clockwise.
+
+t r t' l' t r' t' l
+
+Order: 3
+
+### rotate 2 or 3 corners clockwise
+
+Rotate the bottom front right corner clockwise 120°. Repeat if it needs to be rotated 240°, otherwise follow with d or d', then repeat to get a total of 360° rotation on 2 or 3 corners. AFterwards, reverse all d/ d' moves.
+
+2*(r t r' t')
+
+Order: 3
+
+Example:
+
+1. rotate bottom 3 corners clockwise except the front left one:  
+2*(r t r' t') d' 2*(r t r' t') d' 2*(r t r' t') d d
+
+2. rotate bottom front two corners clockwise, right by 120°, left by 240°:
+2*(r t r' t') d 4*(r t r' t') d'
+
+### turn upper center 180°
+
+Rotate the upper center 180°, also changes rotation of some other centers.
+
+8*(slice_y t)
+
+Order: 2
+
+## Solution strategy
+1. Solve first layer's corners intuitively with correct orientation.
+2. Try to cycle bottom layer's corners to get correct positions.
+3. If necessary, swap two of the bottom corners.
+4. Rotate bottom layer's corners to get correct orientation.
+5. solve first layers edges intuitively.
+6. solve second layer's edge positions by cycling 3 at a time.
+7. solve top layer edge positions by cycling 3 at a time.
+8. flip edges pairwise.