Added box version info library

game-engine/box-version-info-library.md

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+# Box Version Info Library
+
+The box_version_info library simply provides version info about the current build of Box.
+
+The box_version_info library can usually be accessed with the `import` keyword:
+
+```
+import box_version_info;
+import box_version_info as box_version_info; //can be aliased
+```
+
+## Defined Variables
+
+### major
+
+This variable is the major version number of Box at the time of compilation.
+
+### minor
+
+This variable is the minor version number of Box at the time of compilation.
+
+### patch
+
+This variable is the patch version number of Box at the time of compilation.
+
+### build
+
+This variable is a string representing the date and time that the engine was compiled.
+
+### author
+
+This variable contains the name of Box's lead author, and his game studio.