Added a few help files for cyclone

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+#N canvas 1172 268 591 353 10;
+#X declare -lib cyclone;
+#X text 37 24 single-pole lowpass filter;
+#X text 56 272 onepole's advantages are efficiency and simplicity.
+it works well as a pre- or post-processing stage for other treatments
+\, such as waveshaping or filtering \, which can benefit from a gentle
+roll-off of high frequencies.;
+#X text 38 124 this filter is equivalent to a biquad~ object with the
+coefficients \, [ a0 = k \, b1 = k - 1 ] \, as demonstrated below.
+;
+#X text 38 83 where k represents the cutoff frequency in radians. this
+generates a single-pole lowpass filter with a 6dB/octave attenuation.
+;
+#X text 65 66 out = prev + k * (in - prev);
+#X text 38 50 onepole~ implements the minimal filter equation:;
+#X obj 427 24 import cyclone;
+#X text 189 220 inlet 2: float or signal sets cutoff frequency (Hz)
+;
+#X obj 89 221 onepole~ 300;
+#X text 187 236 argument initializes frequency;