Add README to SMTI-GRP algorithms

Author: WPettersson

SMTI-GRP/README.md

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+# Naming
+
+The following table relates these folders to the names used in the paper
+
+| Folder name | Algorithm index in paper
+|-------------|-------------------------|
+|1_NOBIN_1STA_NOMERGED | M1 |
+|2_YESBIN_1STA_NOMERGED | M2 |
+|3_NOBIN_1STA_YESMERGED | M3 |
+|4_YESBIN_1STA_YESMERGED | M4 |
+|7_NOBIN_2STA_YESMERGED | M5 |
+|8_YESBIN_2STA_YESMERGED | M6 |
+
+The folder 1_NOBIN_1STA_NOMERGED_NOPREPROCESS is M1 but with preprocessing disabled.
+The folder 1_NOBIN_1STA_NOMERGED_NOPREPROCESS_NOPRESOLVE is M1 but with preprocessing and Gurobi pre-solving disabled.
+The folder 4_YESBIN_1STA_YESMERGED_NOPREPROCESS is M4 but with preprocessing disabled.
+The folder 4_YESBIN_1STA_YESMERGED_PRIORITY is M4 with priorities on branching variables.
+The folder 5_NOBIN_2STA_NOMERGED uses 2 stability constraints, but no dummy
+variables or merged stability constraints, and is not in the paper.
+The folder 6_YESBIN_2STA_NOMERGED uses 2 stability constraints, dummy
+variables, but does not merge stability constraints, and is not in the paper.
+The folder 9_NOBIN_1STA_NOMERGED_GS is M1 with Gale-Shapley used to find an
+incumbent solution.
+The folder A_YESBIN_1STA_YESMERGED_GS is M4 with Gale-Shapley used to find an
+incumbent solution.
+