feat: Add Ruby code - chapter "Searching" (#1262)
* create RUBY searching files & finish two_sum.rb
* finish linear_search.rb
* finish hashing_search.rb
* finish binary_search.rb
* finish binary_search_insertion.rb
* finish binary_search_edge.rb
* fix: change 'or' to '||'
* fix: Adjust the code style(ruby searching)
* fix: repair file name
* fix: Adjust the output format
* fix: fix 0...nums.length & delete useless require & change into __FILE__==0 block
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