Added the TreeCmp source code

src_external/TreeCmp_v1.1-b308/TreeCmp/examples/plain/plain.trees

+(a,b,c,(d,e));
+(a,b,(c,(d,e)));
+((a,b,c),d,e);
+(a,b,c,d,e);
\ No newline at end of file

src_external/TreeCmp_v1.1-b308/TreeCmp/examples/prune/diff_taxa.trees

+((a,b),(c,(d,e)));
+((a,f),(d,(c,e)));

src_external/TreeCmp_v1.1-b308/TreeCmp/examples/prune/diff_taxa.trees.w_2.out

+No	Tree1	Tree2	Tree1_taxa	Tree2_taxa	Common_taxa	MatchingSplit
+1	1	2	5	5	4	2.0000