add icons for toolbar and desktop

icon/emacsclient.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Name=Emacs Client
+GenericName=Text Editor
+Comment=Edit text
+MimeType=text/english;text/plain;text/x-makefile;text/x-c++hdr;text/x-c++src;text/x-chdr;text/x-csrc;text/x-java;text/x-moc;text/x-pascal;text/x-tcl;text/x-tex;application/x-shellscript;text/x-c;text/x-c++;
+Exec=emacsclient -a "" -c %F
+Icon=~/.config/emacs/icon/spacemacs.png
+Type=Application
+Terminal=false
+Categories=Development;TextEditor;
+StartupWMClass=Emacs
+Keywords=Text;Editor;