updating DIRECTORY.md

Author: Miladkhoshdel

DIRECTORY.md

@@ -87,6 +87,7 @@
   * [Count 1S Brian Kernighan Method](bit_manipulation/count_1s_brian_kernighan_method.py)
   * [Count Number Of One Bits](bit_manipulation/count_number_of_one_bits.py)
   * [Excess 3 Code](bit_manipulation/excess_3_code.py)
+  * [Fast Walsh Hadamard Transform](bit_manipulation/fast_walsh_hadamard_transform.py)
   * [Find Previous Power Of Two](bit_manipulation/find_previous_power_of_two.py)
   * [Find Unique Number](bit_manipulation/find_unique_number.py)
   * [Gray Code Sequence](bit_manipulation/gray_code_sequence.py)
@@ -787,6 +788,7 @@
     * [Adams Bashforth](maths/numerical_analysis/adams_bashforth.py)
     * [Bisection](maths/numerical_analysis/bisection.py)
     * [Bisection 2](maths/numerical_analysis/bisection_2.py)
+    * [Brent Method](maths/numerical_analysis/brent_method.py)
     * [Integration By Simpson Approx](maths/numerical_analysis/integration_by_simpson_approx.py)
     * [Intersection](maths/numerical_analysis/intersection.py)
     * [Nevilles Method](maths/numerical_analysis/nevilles_method.py)