adding fee stats table

ante/fee-notes.md

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+# Notes about Gas prices and gas used
+
+NOTES:
+
+- the gas used depends on the current state of the chain
+- the gas records below are based on the empty state
+
+| operation                                      | gas used |
+| :--------------------------------------------- | -------: |
+| x/bank send                                    |    31029 |
+| x/group create                                 |    68908 |
+| x/oracle MsgAggregateExchangeRateVote (3 curr) |    66251 |
+| x/oracle MsgAggregateExchangeRateVote (6 curr) |    69726 |
+| default gas limit                              |   200000 |
+
+### Target price (in USD cent) for x/bank send
+
+| umee price (usd cent) | gas price in uumee | fee (usd cent) |
+| --------------------: | -----------------: | -------------: |
+|                     2 |                0.2 |         0.0124 |
+|                     2 |                0.1 |         0.0062 |
+|                     2 |               0.02 |        0.00124 |
+|                     5 |                0.2 |          0.031 |
+|                     5 |                0.1 |         0.0155 |
+|                     5 |               0.02 |         0.0031 |
+
+### Target price (in USD cent) for validator oracle txs (with 6 currencies) per day
+
+There are roughly 10tx / minute and 14400 per day.
+Validator has to do 2 tx (prevote and vote) every 5 blocks.
+Validator will need to do `5760 = 2*14400/5` tx.
+
+| umee price (usd cent) | gas price in uumee | fee (usd cent) |
+| --------------------: | -----------------: | -------------: |
+|                     2 |                0.2 |         161.28 |
+|                     2 |                0.1 |          80.64 |
+|                     2 |               0.02 |         16.128 |
+|                     5 |                0.2 |          403.2 |
+|                     5 |                0.1 |          201.6 |
+|                     5 |               0.02 |          40.32 |
+
+### Target price (in USD) for default gas limit
+
+| umee price (usd cent) | gas price in uumee | fee (usd cent) |
+| --------------------: | -----------------: | -------------: |
+|                     2 |                0.2 |           0.08 |
+|                     2 |                0.1 |           0.04 |
+|                     2 |               0.02 |          0.008 |
+|                     5 |                0.2 |            0.2 |
+|                     5 |                0.1 |            0.1 |
+|                     5 |               0.02 |           0.02 |