add Rust and Python snippets

qdrant-landing/content/documentation/headless/snippets/create-payload-index/asciifolding-full-text/python.md

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+```python
+from qdrant_client import QdrantClient, models
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.create_payload_index(
+    collection_name="{collection_name}",
+    field_name="name_of_the_field_to_index",
+    field_schema=models.TextIndexParams(
+        type="text",
+        tokenizer=models.TokenizerType.WORD,
+        ascii_folding=True,
+    ),
+)
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/asciifolding-full-text/rust.md

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+```rust
+use qdrant_client::qdrant::{
+    CreateFieldIndexCollectionBuilder,
+    TextIndexParamsBuilder,
+    FieldType,
+    TokenizerType,
+};
+use qdrant_client::Qdrant;
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+let text_index_params = TextIndexParamsBuilder::new(TokenizerType::Word)
+    .ascii_folding(true);
+
+client
+    .create_field_index(
+        CreateFieldIndexCollectionBuilder::new(
+            "{collection_name}",
+            "name_of_the_field_to_index",
+            FieldType::Text,
+        ).field_index_params(text_index_params.build()),
+    )
+    .await?;
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/lowercase-full-text/python.md

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+```python
+from qdrant_client import QdrantClient, models
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.create_payload_index(
+    collection_name="{collection_name}",
+    field_name="name_of_the_field_to_index",
+    field_schema=models.TextIndexParams(
+        type="text",
+        tokenizer=models.TokenizerType.WORD,
+        lowercase=False,
+    ),
+)
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/lowercase-full-text/rust.md

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+```rust
+use qdrant_client::qdrant::{
+    CreateFieldIndexCollectionBuilder,
+    TextIndexParamsBuilder,
+    FieldType,
+    TokenizerType,
+};
+use qdrant_client::Qdrant;
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+let text_index_params = TextIndexParamsBuilder::new(TokenizerType::Word)
+    .lowercase(false);
+
+client
+    .create_field_index(
+        CreateFieldIndexCollectionBuilder::new(
+            "{collection_name}",
+            "name_of_the_field_to_index",
+            FieldType::Text,
+        ).field_index_params(text_index_params.build()),
+    )
+    .await?;
+```