Add readme to js-stellar-base
Add readme to js-stellar-base

Payshare/js-stellar-base,strllar/js-stellar-base,manran/js-stellar-base,Payshare/js-stellar-base,johansten/js-stellar-base,stellar/js-stellar-base,strllar/js-stellar-base,johansten/js-stellar-base,stellar/js-stellar-base,manran/js-stellar-base,strllar/js-stellar-base,johansten/js-stellar-base,manran/js-stellar-base