[DOCS] Add welcome art GIF to README #702

Job	Run time
Compilation Test (gcc)	24s
Compilation Test (clang)	25s
Compilation Test (clang-12)	22s
Combine Compilation Test Results	1s
Prepare Test Matrix	2s
Regression Test (ne, Empty Env) / Empty Env	33s
Regression Test (b, Bonus Part) / Bonus Part	43s
Regression Test (m, Mandatory Part) / Mandatory Part	1m 34s
Regression Test (d, Hardcore) / Hardcore	34s
Memory Leak Test (1_groups.sh)	38s
Memory Leak Test (1_operators.sh)	42s
Memory Leak Test (1_wildcards.sh)	50s
Memory Leak Test (2_correction.sh)	1m 55s
Memory Leak Test (3_subshell.sh)	1m 1s
Memory Leak Test (8_syntax_errors.sh)	1m 3s
Memory Leak Test (9_go_wild.sh)	44s
Memory Leak Test (leaks.sh)	27s
Memory Leak Test (0_compare_parsing.sh)	1m 17s
Memory Leak Test (10_parsing_hell.sh)	1m 54s
Memory Leak Test (11_expansion.sh)	34s
Memory Leak Test (1_builtins_cd.sh)	53s
Memory Leak Test (1_builtins_echo.sh)	1m 16s
Memory Leak Test (1_builtins_env.sh)	34s
Memory Leak Test (1_builtins_exit.sh)	1m 24s
Memory Leak Test (1_builtins_export.sh)	1m 7s
Memory Leak Test (1_builtins_pwd.sh)	38s
Memory Leak Test (1_builtins_unset.sh)	55s
Memory Leak Test (1_pipelines.sh)	1m 30s
Memory Leak Test (1_redirs.sh)	1m 29s
Memory Leak Test (1_scmds.sh)	1m 0s
Memory Leak Test (1_variables.sh)	1m 0s
Memory Leak Test (2_correction.sh)	1m 49s
Memory Leak Test (2_path_check.sh)	39s
Memory Leak Test (8_syntax_errors.sh)	1m 0s
Memory Leak Test (9_go_wild.sh)	53s
Memory Leak Test (1_segfault.sh)	1m 2s
Memory Leak Test (10_no_env.sh)	1m 34s
Combine Regression Test Results	1s
Combine Memory Leak Test Results	1s
	34m 28s

Provide feedback