INSTRUCTIONS: Add calculations section

INSTRUCTIONS.md

@@ -3,7 +3,7 @@
 * Install `yarn` and `npm`.
 * Run `yarn` at the repo root.
 * Use the same BIP39 compatible mnemonic in both `truffle.js` (can be set by environment variable `TEST_MNEMONIC`) and for your client.
-* Change the `from` key in `truffle.js` for any network other than Ropsten or Kovan.
+* Change the `from` key in `truffle.js` for any network that requires it.
 * Compile contracts:
   ```
   ./node_modules/.bin/truffle compile
@@ -27,3 +27,15 @@
   ```
   ./node_modules/.bin/truffle migrate --network development_migrate -f 2
   ```
+
+## Calculations
+
+* Install `python3.6`.
+* Caculate outcomes of different ceilings by running:
+  ```
+  ./scripts/ceiling_curve_calc.py --limit=6100000000000000000000 --curve-factor=300 --fee-token=0.1
+  ```
+* Run the following to see all options:
+  ```
+  ./scripts/ceiling_curve_calc.py --help
+  ```