Extension of #198

[ChefMist]

Extension of #198 to include add liquidity and how it might look like

attached logs output from the POC

Logs:
  ---------start of testSwap_xx add liquidity----------------------
    balanceof user t0:  1010
    balanceof user t1:  1010
    balanceof user hAddr:  0
    balanceof user hAddr:  0
    balanceof user vault:  0
    balanceof user vault:  0
  -------------------------------
  ---------end of testSwap_xx add liquidity ----------------------
    balanceof user t0:  1009
    balanceof user t1:  1009
    balanceof user hAddr:  0
    balanceof user hAddr:  0
    balanceof user vault:  1
    balanceof user vault:  1
  -------------------------------
  ---------start of testSwap_xx swap----------------------
    reserveOfApp t0 (ethers) 0
    reserveOfApp t1 (ethers) 0
    balanceof user t0:  1009
    balanceof user t1:  1009
    balanceof user hAddr:  0
    balanceof user hAddr:  0
  -------------------------------
  ---------end of testSwap_xx swap----------------------
    reserveOfApp t0 (ethers) 0
    reserveOfApp t1 (ethers) 0
    balanceof user t0:  1008
    balanceof user t1:  1010
    balanceof user hAddr:  0
    balanceof user hAddr:  0
  -------------------------------