It has been discussed here several times that the group must be for subjects that are directly or indirectly related to Sinhala Unicode and other technical matters. ASSUMING that you were not aware of those discussions themselves, you still show the awareness of the concept of topical relevance by the very question "සිංහල යුනිකෝඩ් වලින් එහාට යමුද ?".
Yet you post a totally unrelated post anyway, directly out of a political party website. I think this is link spamming at best, and your seemingly innocent question does not wash off that plain fact, because you piggybacked the link anyway with the message which is what you wanted to do. Please take your propaganda elsewhere.