tutorials: added tutorial for project configuration file

tutorials/03-advanced/03-project-file/README.md

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+# Project description file
+
+A LCA as Code project can be specified with a YAML configuration.
+In this tutorial, the configuration file is used to specify:
+- the project name
+- the project description
+- and customizing the CSV connector
+
+Hence, the file `lcaac.yaml` contains
+```yaml
+name: Project file
+description: Sample project to illustrate the use of lcaac.yaml
+connectors:
+  - name: csv
+    options:
+      directory: data
+```
+
+while the file `lcaac-mock.yaml` contains
+```yaml
+name: Project file
+description: Sample project to illustrate the use of lcaac.yaml
+connectors:
+  - name: csv
+    options:
+      directory: mock
+```
+
+Here each file specifies a different location for the folder containing the CSV files supporting the datasources.
+You can choose which settings to use with the cli option `-p` or `--project`.
+```bash
+lcaac assess --project lcaac.yaml main
+lcaac assess --project lcaac-mock.yaml main
+```

tutorials/03-advanced/03-project-file/data/inventory.csv

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+id,weight
+s01,1
+s02,2
+s03,3
+s04,4

tutorials/03-advanced/03-project-file/lcaac-mock.yaml

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+name: Project file
+description: Sample project to illustrate the use of lcaac.yaml
+connectors:
+  - name: csv
+    options:
+      directory: mock

tutorials/03-advanced/03-project-file/lcaac.yaml

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+name: Project file
+description: Sample project to illustrate the use of lcaac.yaml
+connectors:
+  - name: csv
+    options:
+      directory: data

tutorials/03-advanced/03-project-file/main.lca

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+datasource inventory {
+    location = "inventory.csv"
+    schema {
+        id = "s01"
+        weight = 0 kg
+    }
+}
+
+process main {
+    products {
+        1 kg main
+    }
+    impacts {
+        for_each item from inventory {
+            item.weight mass
+        }
+    }
+}
+
+test main_with_data {
+    given {
+        1 kg main from main
+    }
+    assert {
+        mass between 10 kg and 10 kg
+    }
+}
+
+test main_with_mock_data {
+    given {
+        1 kg main from main
+    }
+    assert {
+        mass between 100 kg and 100 kg
+    }
+}

tutorials/03-advanced/03-project-file/mock/inventory.csv

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+id,weight
+s01,10
+s02,20
+s03,30
+s04,40