Update README.md

README.md

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 # chess
-Chess game in c++
+Chess engine in c++
+
+Will turn into game eventually.
+
+### Compiling
+
+`cd src`
+`make && ./chess.out`
+
+#### Comiling Tests
+`cd tests`
+`make && ./tests.out -s`
+
+The -s option prints the values of tests that pass, as well as tests that fail.
+If you want to only print the values of tests that fail, remove the -s flag.