Update README.md

README.md

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-# David Calc
-## for Windows Command Prompt and Docker
+# David Calc for Windows Command Prompt and Docker
+## Information
 https://hub.docker.com/r/dugo3number2/calc
 `docker pull dugo3number2/calc`
 Repl.it: https://repl.it/@DavidDGTNT/calc
+## Building
+### GNU G++
+#### With GNU Make
+`make`
+#### Without GNU Make
+`g++ -o calc main.cpp`
+### MinGW
+#### With included make
+`make -f Makefile.win`
+#### Without make or building desktop version
+`g++ -o calc.exe <main.cpp / windows-desktop.cpp>`
+### Visual Studio (all modern versions)
+#### CLI
+`cl main.cpp`
+#### IDE
+Open up the IDE and open the solution file. You can build it as you would normally from there.