Add basic docs on darwin.js/ genetic backtester

docs/scripts/genetic_backtester.md

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+# Genetic Backtester - Darwin
+
+The Genetic Backtester will execute a range of simulations with a range of parameters, limited by the population size, per strategy. Once all sims in the population are complete, the top results are taken as the starting point for the next generation. This continues indefinitely, until interrupted by the user.
+
+## Installation
+
+This script has additional node dependencies that need to be installed before usage:
+
+```bash
+cd scripts/genetic_backtester
+npm install
+cd ../../
+```
+
+## Usage
+
+Launch the genetic backtester from the zenbot root by directly invoking darwin.js:
+```bash
+  ./scripts/genetic_backtester/darwin.js --days=30 --asset_capital=0 --currency_capital=1000 --selector="gdax.BTC-USD" --population=150 --use_strategies="macd,trend_ema"
+```
+
+## Parameters
+
+The following parameters are available when executing darwin.js:
+```
+// Primary Parameters
+--use_strategies="strategyname"                                                         # comma separated strategy list to test with. Leave blank to test all.
+--population_data=./simulations/generation_data_1514280516_gen_582.json                 # (optional) continue backtesting from a specific generation
+--population=150                                                                        # (optional) number of simulation per generation
+
+// General Parameters
+--selector="gdax.BTC-USD"                                                               # selector to run simulations on
+--days=30                                                                               # how many days to execute per simulation
+--currency_capital=1000                                                                 # currency amount to start simulations with. Needs to be bigger than 0 (see issue #449).
+--asset_capital=0                                                                       # (optional) asset amount to start simulations with.
+
+```
+
+## Results
+
+When the next generation starts testing, a csv file will appear in the simulations folder. This CSV contains all simulations that were executed in that generation, including the parameters and results. 
+
+The top results are listed at the top of the file, in descending order.
+
+## Further Customization
+
+The default ranges can be further customized per strategy by editing the [darwin.js](blob/master/scripts/genetic_backtester/darwin.js) script.

docs/scripts/readme.md

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+# Scripts
+In the scripts folder are a number of helper scripts. This is the corresponding documentation so far, with more information on each set of scripts:
+
+* [auto_backtester](auto_backtester.md) *not done yet, contributions welcome*
+* [genetic_algo](genetic_algo.md) *not done yet, contributions welcome*
+* [Genetic Backtester](genetic_backtester.md)
+