docs: add docs for telegram games

[chentsulin]

add docs for telegram games

[codecov-io]

Codecov Report

Merging #535 into master will increase coverage by 2.15%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
+ Coverage   79.85%   82.01%   +2.15%     
==========================================
  Files          89       97       +8     
  Lines        3976     3936      -40     
  Branches      954      943      -11     
==========================================
+ Hits         3175     3228      +53     
+ Misses        766      676      -90     
+ Partials       35       32       -3

Impacted Files	Coverage Δ
packages/bottender/src/bot/Bot.ts	98.34% <0%> (-0.03%)	:arrow_down:
packages/bottender/src/cli/index.ts	0% <0%> (ø)	:arrow_up:
packages/bottender/src/index.ts	100% <0%> (ø)	:arrow_up:
packages/bottender-express/src/createMiddleware.ts	100% <0%> (ø)	:arrow_up:
packages/bottender/src/browser.ts	100% <0%> (ø)	:arrow_up:
packages/bottender/src/messenger/MessengerEvent.ts
packages/bottender/src/slack/SlackEvent.ts
packages/bottender/src/console/ConsoleConnector.ts
packages/bottender/src/line/LineConnector.ts
...ages/bottender/src/messenger/MessengerConnector.ts
... and 57 more

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