Feature/injected database

[wenshuoguo]

• Add new class CampaignKeeper to store dumped coupon image and coupon counting number in Redis
• Methods for querying sharing code and parent user id are added
• Test cases added

[codecov[bot]]

Codecov Report

Merging #100 into develop will increase coverage by 0.3%. The diff coverage is 72.4%.

@@             Coverage Diff             @@
##             develop    #100     +/-   ##
===========================================
+ Coverage       63.4%   63.7%   +0.3%     
- Complexity       314     328     +14     
===========================================
  Files             38      39      +1     
  Lines           1648    1676     +28     
  Branches         214     214             
===========================================
+ Hits            1046    1069     +23     
- Misses           528     530      +2     
- Partials          74      77      +3

Impacted Files	Coverage Δ	Complexity Δ
...ot/src/main/java/database/querier/UserQuerier.java	100% <ø> (ø)	3 <0> (ø)	:arrow_down:
...tbot/src/main/java/database/keeper/MenuKeeper.java	84.2% <0%> (ø)	7 <0> (ø)	:arrow_down:
...-chatbot/src/main/java/database/keeper/Keeper.java	78.5% <62.5%> (-21.5%)	6 <3> (+3)
.../src/main/java/database/keeper/CampaignKeeper.java	80% <80%> (ø)	10 <10> (?)
...g-chatbot/src/main/java/agent/FoodRecommender.java	74.6% <0%> (+0.2%)	52% <0%> (ø)	:arrow_down:
...hatbot/src/main/java/database/querier/Querier.java	65.3% <0%> (+0.6%)	34% <0%> (+1%)	:arrow_up:

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[johnding1996]

And one more thing is to remove your DS_Store binary file or add it to .gitignore.

[johnding1996]

You can also create a issue which holds this 5 story points.