Add links to Colab for root search using Brent's method.

PiperOrigin-RevId: 268888929

Author: matejr

README.md

@@ -110,7 +110,7 @@ for end-to-end examples. It includes tutorial notebooks such as:
   * [American Option pricing under the Black-Scholes model](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/American_Option_Black_Scholes.ipynb)
   * [Monte Carlo via Euler Scheme](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Monte_Carlo_Euler_Scheme.ipynb)
   * [Black Scholes: Price and Implied Vol](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Black_Scholes_Price_and_Implied_Vol.ipynb).
-
+  * [Root search using Brent's method](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Root_Search.ipynb)
 
 The above links will open Jupyter Notebooks in Colab.
 

tf_quant_finance/examples/README.md

@@ -15,7 +15,7 @@ List of examples:
   *   [American Option pricing under the Black-Scholes model](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/American_Option_Black_Scholes.ipynb).
   *   [Monte Carlo via Euler Scheme](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Monte_Carlo_Euler_Scheme.ipynb).
   *   [Black Scholes: Price and Implied Vol](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Black_Scholes_Price_and_Implied_Vol.ipynb).
-
+  *   [Root search using Brent's method](https://colab.research.google.com/github/google/tf-quant-finance/blob/master/tf_quant_finance/examples/jupyter_notebooks/Root_Search.ipynb)
 
 # TensorFlow training