Create en-US.md

conversion from Word file into .md format
Merge pull request #160 from peiying2/patch-48

Create en-US.md
Update bn-BD.md

copied from bn-IN.
Update bn-BD.md

copied from bn-IN
Merge pull request #164 from peiying2/patch-53

Update bn-BD.md
Merge pull request #163 from peiying2/patch-52

Update bn-BD.md