feat(merge_two): add new py exercise to scripting piscine

subjects/devops/merge_two/README.md

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+## Merge two
+
+One very useful data structure in Python are the dictionaries, in this exercise we will start to familiarize and use them.
+
+### Instructions
+
+Create a file `merge_two.py` which will have a function named `merge_two()`. This function will accept two dictionaries and return a third one which will be the merge of the two inputs.
+
+Here is the prototype of the function:
+
+```python
+def merge_two(first_dict, second_dict):
+    # this is a function,
+    # write your code here
+```
+
+### Usage
+
+Here is a possible code to test your function. Put it in another file (ex: `test.py`):
+
+```python
+from merge_two import merge_two
+
+first = {
+    "Bob": 36,
+    "Louise": 23,
+    "Lea": 34
+}
+second = {
+    "Louise": 44,
+    "Romolo": 30,
+    "Lea": 22
+}
+print(merge_two(first, second))
+```
+
+Run your test file with the following command:
+
+```console
+$ python3 test.py
+{'Bob': 36, 'Louise': 44, 'Lea': 22, 'Romolo': 30}
+$
+```
+
+### Hints
+
+- If a key is repeated in both dictionaries the value retained will be the one in `second_dict`.
+
+- There is different ways to merge dictionaries, take the time to understand the differences in between those techniques and try more than one technique to better retain it.
+
+### References
+
+- [Merging dictionaries in Python](https://www.geeksforgeeks.org/python-merging-two-dictionaries/)