Add build instructions

Author: CrazyPython

Makefile

@@ -0,0 +1,11 @@
+.PHONY = md2sexpr-build
+
+tree-query: tree-query.d interp.d query.d parser.d
+	dmd -g -debug -check=invariant -unittest tree-query.d interp.d query.d parser.d
+
+md2sexpr-build:
+	~/dlang/ldc-1.23.0/bin/ldc2 --link-defaultlib-shared=false -O3 -release md2sexpr.d parser.d
+
+tree-query-build:
+	~/dlang/ldc-1.23.0/bin/ldc2 --link-defaultlib-shared=false -O2 -release tree-query.d interp.d query.d parser.d
+	strip tree-query