add contributing guide

Author: tiimgreen

CONTRIBUTING.md

@@ -0,0 +1,28 @@
+# SingleStore Spaces Contributing Guide
+
+## File structure
+
+To add a new space you should create a new folder inside `/notebooks`.
+
+Here are some requirements for the file structure
+
+1. Folder name must be `kebab-case`
+2. Folder must contain a Jupyter Notebook called `notebook.ipynb`
+3. Folder must contain a `meta.toml` file which holds information about your SingleStore Space. See below for the structure of this file.
+
+### `meta.toml` file
+
+Your `meta.toml` file should have a `[meta]` section with the following keys:
+
+- title: string
+- description: string (optional)
+- tags: string[] (optional)
+
+Example:
+
+```toml
+[meta]
+title="Atlas & Kai for Mongo Side-by-Side"
+description="Compare performance on same code from simple to more complex queries"
+tags=["mongodb", "kai"]
+```