Merge pull request #4 from jackyjia/feature/1

ISSUE-1: updates README

README.md

@@ -1,32 +1,34 @@
-# MySuperLedger
-MySuperLedger aims to enable SMEs with accounting capability that internet giants such as Alipay, PayPal have.
+# What is MySuperLedger
+MySuperLedger is a database specifically designed for accounting purpose. You can use it to create accounts, create ledgers, 
+do double-entry bookkeeping. Its goal is to equip SMEs with the capability to handle super large accounting volume 
+which usually internet giants such as Alipay, WeChat Pay, PayPal have.
 
-## Why SMEs need accounting feature that big companies have
+## Why SMEs will need to handle large accounting volume that big companies have
 The main reason is I believe the pay-as-you-go payment model will lead to a burst of bookkeeping activities which can easily
 reach the same magnitude of traffic and high-availability requirement that only internet giants have.
 
-The accounting capability will be crucial to the success of SMEs that rely on the pay-as-you-go model. However they usually 
-don't have sufficient resources to develop their own accounting software, and existing accounting softwares 
-cannot meet these requirements.
+The accounting capability will be crucial to the success of SMEs that rely on the pay-as-you-go model. However, they usually 
+don't have sufficient resources to develop their own accounting software, and existing ones are feature-rich but don't meet
+these non-functional requirements, i.e., high traffic volume, 7x24 available, zero data loss, 100% auditable.
 
 ## Why I can do this
 I designed and led the development of the financial accounting system for eBay management payment. The system can handle 1 million transactions
-per second and easily scale out to support even higher throughput. It's also high available, 99.999% available in over two years, 
-that's 7-minutes downtime, a big part of which was caused by mis-operation. Besides, the system can guarantee no data loss, which is
-also a must-have requirement on accounting system. Last but not least, it's 100% audit-able, it will not only tell you the 
+per second and can easily scale out to support even larger volume. It is also high available, 99.999% available in over two years, 
+that's 7-minutes downtime, it could get more 9s if that mis-operation didn't happen. Thirdly, the system can guarantee no data loss, which is
+also a must-have requirement on financial accounting system. Last but not least, it's 100% audit-able, it will not only tell you the 
 account's latest balance, but also evey transaction that leads to it.
 
-Here're two articles I wrote about the system.
+Below are two articles I wrote about the system.
 1. [超越“双十一” | ebay支付核心账务系统架构演进之路](https://mp.weixin.qq.com/s/O5_Rde5uUXvmBS2B7w2hOQ)
 2. [eBay支付账务系统架构解析之“读”一无二](https://mp.weixin.qq.com/s?__biz=MzA3MDMyNDUzOQ==&mid=2650512756&idx=1&sn=04fd97a4c4129bb26c5dd3b6ea7e75f9&chksm=8731a520b0462c369671c63d06721ee7817984bf041964fbdeb24d513c9b31451cbb544ed2c1&scene=178&cur_album_id=1590887959409590275#rd)
 
 ## What's incoming
 I'm going to provide following features:
-1. Create an account with COA (Chart of Accounts) support
+1. Create a Credit or Debit account
 2. Create a ledger
-3. Post a transaction to a ledger
+3. Add a transaction to a ledger
 4. Query account's balance
-5. Query the transaction history of a ledger
+5. Query the transaction history of an account or ledger
 
 Stay tuned.