docs(credentials_searches): add description of exercise

subjects/devops/credentials_searches/README.md

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+## credentials_searches
+
+### Instructions
+
+Create a file `credentials_searches.py` that contains a function `credentials_search` which takes no parameters and searches for the keys `password` and `secret` in a file called `logs.json`.
+
+- If both keys are found, the function should create a new json file named 'credentials.json' and save the values of those keys in it.
+
+- If only one of the keys is found, the function should create a new json file named 'credentials.json' and save the value of that key in it.
+
+- If neither key is found, the function should not create the 'credentials.json' file.
+
+- If the 'logs.json' file is empty or is not a json file, the function should not create the 'credentials.json' file.
+
+- If the logs.json file does not exist, the function should not create the 'credentials.json' file.
+
+- If the keys are found in a nested object, the function should create the 'credentials.json' file and save the values of the keys in it.
+
+### Usage
+
+Here is an example of how to use the credentials_search function:
+
+With this file `logs.json`:
+
+```json
+{
+  "password": "test_password",
+  "other": "value",
+  "secret": "test_secret"
+}
+```
+
+If you run your function:
+
+```python
+credentials_search()
+```
+
+Your function should generate this file `credentials.json`:
+
+```json
+{
+  "password": "test_password",
+  "secret": "test_secret"
+}
+```
+
+### Hints
+
+- The json module can be used to read and write JSON files.
+
+- The os module can be used to check if a file exists and remove a file.
+
+- Remember that the function should be able to search for the keys password and secret in nested json objects.
+
+### References
+
+- [json module](https://www.w3schools.com/python/python_json.asp)
+
+- [os module](https://docs.python.org/3/library/os.html)