Add TILs about jinja2

Author: Shourai

python/list-of-dictionaries-as-jinja2-variables.md

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+# Using a list of dictionaries as variables to render a jinja2 template
+
+```python
+from jinja2 import Environment, FileSystemLoader
+
+environment = Environment(loader=FileSystemLoader("./"))
+template = environment.get_template("template.j2")
+
+list_of_dicts = [{"a":1, "b":2}, {"a":3, "b":4}]
+
+print(template.render(variables=list_of_dicts))
+```
+
+The important part is the `variables` kwarg.
+
+```jinja2
+{% for var in variables %}
+    {{ var.a }}
+    {{ var.b }}
+{% endfor%}
+```

python/read-jinja2-template-from-file.md

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+# How to open an jinja2 template from a file
+
+```python
+from jinja2 import Environment, FileSystemLoader
+
+environment = Environment(loader=FileSystemLoader("./"))
+template = environment.get_template("template.j2")
+
+print(template.render(<variables>))
+```