Update README.md

Author: doruirimescu

README.md

@@ -16,7 +16,9 @@ First step after cloning: `./install_requirements.sh`
 Second step: read [this](https://github.com/doruirimescu/python-trading/tree/master/Trading/live/scripts#readme)
 
 ### Navigation
-This repo is HUGE, and you will probably not need 90% of the things in here.
+This repo is **HUGE**, and you will probably not need 90% of the things in here. 
+
+There is a lot of code that deals with data from [xAPI](http://developers.xstore.pro/documentation/). You can make a demo account [here](https://www.xtb.com/cy) and try the more advanced features of this repo, but most of the software here is self-contained.
 
 * Loan management [here](https://github.com/doruirimescu/python-trading/blob/master/Trading/loan/README.md)
 * Investment and precious metal model [here](https://github.com/doruirimescu/python-trading/blob/master/Trading/model/investment.py)
@@ -25,7 +27,22 @@ This repo is HUGE, and you will probably not need 90% of the things in here.
 * Alphaspread cli for stock analysis [here](https://github.com/doruirimescu/python-trading/tree/master/Trading/stock/alphaspread)
 * Rest api [here](https://github.com/doruirimescu/python-trading/tree/master/Trading/api)
 * Daily nasdaq 100 analysis with alphaspread [here](https://github.com/doruirimescu/python-trading/tree/master/Trading/generated)
-* Dividend growth analysis [here](https://github.com/doruirimescu/python-trading/blob/master/Trading/stock/yfinance/dividend_sustainability.py)
+* Dividend growth sustainability analysis [here](https://github.com/doruirimescu/python-trading/blob/master/Trading/stock/yfinance/dividend_sustainability.py)
+* Symbols management, this needs to be frameworked [here](https://github.com/doruirimescu/python-trading/tree/master/Trading/symbols)
+* Dealing with time [here](https://github.com/doruirimescu/python-trading/blob/master/Trading/utils/time.py). Always use these helpers.
+* Complex logical expressions: [criterion](https://github.com/doruirimescu/python-trading/blob/master/Trading/utils/criterion/readme.md)
+
+Whenever something really important comes up, it is eventually extracted as a standalone repo, and becomes an external dependency such as:
+* [Stateful Data Processor](https://github.com/doruirimescu/stateful-data-processor/tree/master)
+* [Exception With Retry](https://github.com/doruirimescu/exception-with-retry)
+
+### Papers
+Yes, I write papers. Some are more mathematical, some are light reads, other are unpublished manuscripts kept in a folder in my room.
+* [Light read] A method for classifying and assessing trades based on exit and entry conditions [here](https://github.com/doruirimescu/python-trading/blob/master/papers/bounded_unbounded_trades.md)
+* [Heavy maths] Optimal risk management, basically an independent derivation of Kelly's criterion [here](https://github.com/doruirimescu/python-trading/blob/master/papers/Optimal%20risk%20management.pdf)
+* [Trading strategy] A Quantitative Approach to Selecting Stocks in a Ranging Market [here](https://github.com/doruirimescu/python-trading/blob/master/papers/ranging_market.md)
+* [My magnum opum strategy] [This](https://github.com/doruirimescu/python-trading/blob/master/papers/mean_reversion_strategy.md) is a work in progress, residing mostly in my head and on scattered papers
+
 
 # Pipeline structure
 ![automation_flow drawio](papers/automation-flow.png)