Add spiceai data connector docs

spiceaidocs/docs/data-connectors/spiceai.md

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+---
+title: 'Spice.ai Data Connector'
+sidebar_label: 'Spice.ai Data Connector'
+description: 'Spice.ai Data Connector Documentation'
+---
+
+The [Spice.ai](https://spice.ai/) Data Connector enables federated SQL query across datasets in the [Spice.ai Cloud Platform](https://docs.spice.ai/building-blocks/datasets).  Access to these datasets require a free [Spice.ai account](https://spice.ai/login).
+
+## Configuration
+### Secrets
+Secrets will be automatically conifgured by using the `spice login` command and loggin in with an active Spice AI account.
+
+- `key`: A Spice.ai API key.
+- `token`: An active personal access token that is configured when logging in to spice via `spice login` 
+
+
+### Parameters
+- `from`: The Spice.ai dataset ID.  For instance `spice.ai/eth.recent_blocks` or `spice.ai/eth.recent_traces`
+
+## Example
+
+```yaml
+- from: spice.ai/eth.recent_blocks
+  name: eth_recent_blocks
+```
+
+## Full Configuration Example
+```yaml
+- from: spice.ai/eth.recent_blocks
+  name: eth_recent_blocks
+  acceleration:
+    enabled: true
+    refresh_mode: append
+```
+
+## Limitations
+`refresh_mode: append` is supported for the following datasets: 
+* eth.recent_blocks
+* eth.recent_transactions
+* eth.recent_traces
+
+All other datasets need to be configured with `refresh_mode: full`.