Update project_metadata.md

Author: priya-gitTest

episodes/project_metadata.md

@@ -18,3 +18,19 @@ exercises: 10
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 ## Introduction
+
+In the previos lesson, we touched upon `pixi.toml` briefly. In this lesson, we will learn about `pyproject.toml`.
+`pyproject.toml` is the most common format for Python projects.
+Please not, for a project maintained using pixi, either of the 2 i.e. `pyproject.toml` or `pixi.toml` are fine. You just need to take case of some specific syntaxes.
+
+To add `pyproject.toml` file, we give the following command : 
+```bash
+pixi init --format pyproject
+```
+
+## Whats inside `pyproject.toml`
+
+- Manifest metadata
+- Editable project install
+- Dependency handling
+- Tasks