Add Wikipedia Persian Dataset (#3629)

Currently, the Open-assistant model doesn't support Farsi. This is a
text-only dataset to learn Farsi (Persian).

One of my friends fine-tuned LLaMa on this dataset and It could
understand Farsi grammar and word usage very well. If the Open-assistant
team wants to add support to Farsi, this should be the first step.

I have transformed the dataset into the standard that has been mentioned
[here](https://projects.laion.ai/Open-Assistant/docs/data/datasets) and
uploaded it to [my huggingface
account](https://huggingface.co/datasets/pourmand1376/fa-wikipedia).


- #2974

data/datasets/__init__.py

@@ -4,6 +4,7 @@
     "tv_dialogue": "sedthh/tv_dialogue",  # TV and Movie dialogues and transcripts
     "fd_dialogue": "sedthh/fd_dialogue",  # TV and Movie dialogues and transcripts from ForeverDreaming
     "tlcv2.0_oa": "pythainlp/tlcv2.0_oa",  # Thai classical literature texts
+    "fa-wikipedia": "pourmand1376/fa-wikipedia",  # Farsi Wikipedia texts
 }
 
 INSTRUCTION_DATASETS = {

data/datasets/fa-wikipedia/README.md

@@ -0,0 +1,6 @@
+This dataset is crawled from
+[farsi wikipedia](https://fa.wikipedia.org/wiki/%D8%B5%D9%81%D8%AD%D9%87%D9%94_%D8%A7%D8%B5%D9%84%DB%8C).
+This is valuable clean text data in persian (Farsi). It contains information
+about all subjects.
+
+It has 2.53M Articles.