code: public Instagram byTag(String tag, boolean exactMatch) {
          addResource(Type.TAG, tag, -1, -1, -1, exactMatch, null);
          return this;
      }
docs: /*
  Adds a resource by tag
  
  @param tag        the tag, e.g cat
  @param exactMatch true when a tag must be an exact match or false when the tag should match the instragram tag
  search behaviour
  @return this