doc: update issue template & README file

[imbajin]

And we could update the other repo(toolchain/computer) like this PR, address the task if free 🔢

[codecov]

Codecov Report

Merging #2131 (d40724f) into master (614d471) will decrease coverage by 2.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2131      +/-   ##
============================================
- Coverage     68.60%   66.59%   -2.01%     
  Complexity      977      977              
============================================
  Files           481      481              
  Lines         39701    39701              
  Branches       5580     5580              
============================================
- Hits          27235    26438     -797     
- Misses         9818    10674     +856     
+ Partials       2648     2589      -59     

Impacted Files	Coverage Δ
...a/org/apache/hugegraph/api/profile/ProfileAPI.java	0.00% <ø> (ø)
...apache/hugegraph/security/HugeSecurityManager.java	77.88% <ø> (ø)
...raph/backend/store/rocksdb/RocksDBStdSessions.java	75.64% <ø> (ø)
...egraph/backend/store/hbase/HbaseStoreProvider.java	0.00% <0.00%> (-100.00%)	⬇️
...hugegraph/backend/store/hbase/HbaseSerializer.java	0.00% <0.00%> (-92.31%)	⬇️
...che/hugegraph/backend/store/hbase/HbaseTables.java	0.00% <0.00%> (-89.86%)	⬇️
...he/hugegraph/backend/store/hbase/HbaseMetrics.java	0.00% <0.00%> (-86.96%)	⬇️
...e/hugegraph/backend/store/hbase/HbaseFeatures.java	0.00% <0.00%> (-83.34%)	⬇️
...ache/hugegraph/backend/store/hbase/HbaseTable.java	0.00% <0.00%> (-76.37%)	⬇️
...ache/hugegraph/backend/store/hbase/HbaseStore.java	0.00% <0.00%> (-75.88%)	⬇️
... and 11 more

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