create snippets for use in emacs-yasnippet

plus more cleanup of main tidal file, and updated readme

snippets/b3drum

@@ -0,0 +1,17 @@
+# -*- mode: snippet -*-
+# name: b3drum
+# group: battery123
+# key: b3drum
+# expand-env: (yas-indent-line 'fixed)
+# --
+-- @b3drum
+d'drum $ cf $
+  -- every 3 rev $ -- (f4) and (f5) remove
+  -- every' 8 8 rev $ -- (f3)
+  stack [
+    -- slow 2 $ s "peri*2 [~ ~ ~ peri] [~ peri peri ~] ~", -- (2), (3) ^peri*2 -- (f5) remove
+    -- whenmod 5 3 (density 2) $ -- (f1)
+    -- iter 2 $ -- (f2)
+    sound "[tok*2 [rm tok]] [psr:1 tok*2]"
+    -- # n (slow 3 $ run 4) -- (1)
+    ]