Update README.md (#51)
Update README.md (#51)

Add goreportcard badge.
debraj-manna-jabong/florest-core,subhajitdatta/florest-core,IshantAgarwal/florest-core,devghosh/florest-core,jabong/florest-core,jabong/florest-core,debraj-manna-jabong/florest-core,subhajitdatta/florest-core,pradeepbkkumar/florest-core,devghosh/florest-core,devghosh/florest-core,IshantAgarwal/florest-core,debraj-manna-jabong/florest-core,jabong/florest-core,subhajitdatta/florest-core,debraj-manna-jabong/florest-core,IshantAgarwal/florest-core,jabong/florest-core,pradeepbkkumar/florest-core,devghosh/florest-core,pradeepbkkumar/florest-core,devghosh/florest-core,pradeepbkkumar/florest-core,subhajitdatta/florest-core,jabong/florest-core,IshantAgarwal/florest-core,debraj-manna-jabong/florest-core,IshantAgarwal/florest-core,devghosh/florest-core,debraj-manna-jabong/florest-core,pradeepbkkumar/florest-core,IshantAgarwal/florest-core,jabong/florest-core,subhajitdatta/florest-core,pradeepbkkumar/florest-core