Add synccommittee inclusion.

docs/usage.md

@@ -451,6 +451,40 @@ $ ethdo slot time --slot=5
 2020-12-01 12:01:23 +0000 GMT
 ```
 
+### `synccommittee` commands
+
+Sync committee commands focus on information about sync committees.
+
+#### `inclusion`
+
+`ethdo synccommittee inclusion` provides information about the inclusion, or not, of a validator's sync committee messages.  Options include:
+  - `account` the account of the validator for which to print sync committee contributions
+  - `index` the index of the validator for which to print sync committee contributions
+  - `pubkey` the public key of the validator for which to print sync committee contributions
+  - `epoch` the specific epoch for which to print sync committee contributions.  Defaults to the last complete epoch
+
+
+```sh
+$ ethdo synccommittee inclusion --index=274946 --epoch=91592
+Epoch: 91593
+Expected: 32
+Included: 30
+Missed: 1
+No block: 1
+Per-slot result: ✓✓✓✓✓✓✓✓ ✓✓✕✓✓✓✓✓ ✓✓✓✓-✓✓✓ ✓✓✓✓✓✓✓✓
+```
+
+#### `members`
+
+`ethdo synccommittee members` provides information about the members of a sync committee.  Options include:
+  - `epoch` the specific epoch for which to provide sync committee members.
+  - `period` the period for which to provide sync committee members.  Can be 'current' or 'next'; dfeaults to 'current'
+
+```sh
+$ ethdo synccommittee members
+138334,116317,231736,65706,60046,148162,274946,34724,18051,122841,269578,121110,89733,154887,202118,243459,267543,82793,59504,238929,55360,272874,93917,83116,264342,244312,264907,79193,15443,27997,127175,140965,64416,66399,173906,268885,67779,48139,215005,191435,107954,225228,148630,169357,61091,223319,40668,184307,95903,81179,237461,41723,119710,243333,248243,42757,228686,252749,17546,231625,132030,15934,108465,104302,93026,191946,63738,80996,90679,227542,75463,64581,242030,5429,61623,157314,145363,224733,232492,45357,80674,198583,221422,48665,154803,128608,172512,261074,102835,129935,255726,40846,218932,139874,194575,17346,171565,76413,237859,103170,95661,83018,73902,246680,35795,257792,23836,136624,45745,190990,124229,37281,23818,233435,253903,37502,8669,31151,267179,27954,181019,145719,112270,1899,184844,175014,121769,41717,218760,44813,255860,64865,31985,231664,134296,88114,185542,27557,1698,62470,79182,184325,80380,8865,218456,178979,243886,9466,221389,131476,160857,62916,195389,160182,99293,100263,242371,144594,227527,275978,65714,74350,60121,46642,219334,157142,99379,203508,84367,251808,276456,92563,199831,215312,193875,129690,104234,44290,227725,194780,163061,162328,176517,278620,137355,212826,131615,125734,151873,18977,147927,272759,160537,210675,180411,24203,37266,247527,128678,270287,90352,23043,169645,5304,183412,237387,79751,37635,275139,95857,185990,235565,49425,255836,254314,77582,104172,168556,143653,64173,64504,130363,216602,218107,181130,191845,56454,2040,270365,161952,222409,45097,51611,219190,154903,162311,257460,106337,110775,42928,275709,202352,54724,272295,274470,35220,19694,10347,169585,104938,35121,212982,190582,77999,110201,141519,239881,81263,84314,148883,254649,256309,270013,254179,134009,149660,177127,201926,30533,164789,154343,57437,28958,135169,186415,218514,171355,165247,213526,100044,184264,93278,269329,159634,4092,224671,217236,123946,80703,85444,247742,17959,146473,128231,167559,133899,181532,33378,79060,119785,249443,180469,43692,169679,154421,114047,87877,28337,59072,19807,204598,220293,99461,55272,227923,4503,12580,27044,68955,157373,61321,265034,106833,31534,69137,264783,129588,70433,88338,113528,226211,123003,118982,131549,60350,78896,165715,119736,52639,93274,164295,278837,186453,69910,36768,249533,106205,184057,253232,88155,121377,242589,148236,250065,191526,277249,157463,226527,93000,64784,176880,176380,144301,52061,169803,134291,96648,211716,223000,157911,256737,100938,50434,41075,114894,259888,116872,218201,83617,76348,256832,17113,50270,96468,128448,36987,127511,42397,10154,49234,193346,126352,57719,17029,213127,157942,187829,2353,62462,73637,29053,120324,108515,254684,35982,188131,217092,256206,85802,105907,21204,147562,188961,154541,131147,16000,225112,58362,170375,42239,188309,60280,125472,220119,268946,65736,274053,223569,60454,239552,4401,139357,279634,162711,112016,90295,170641,239770,212067,213770,78311,49057,256295,28666,167207,166783,213148,30689,72118,55912,197733,205116,106169,40570,225057,122079,126423,217781,212897,147499,201774,10616,157826,155954,258431,212151,255318,97138,151907,181491,40236,272993,104430,178068,56089,10067,185066,93669,124108,12785,230215,67995,196282,248285,215370,167715,186183,238147,164161,15068,127990,166146,244578,195912,199812,248435,135597,143024,225304,27045,238140,87008,272550,165234,218128,160038,17697,25332,23446,265921,201045,241106
+```
+
 ### `validator` commands
 
 Validator commands focus on interaction with Ethereum 2 validators.