Added code for a9.

Codes/Code-A9 (Data visualisation-2).md

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+# A9 - Data visualization-2
+
+---
+
+1. Import library
+
+```python3
+import seaborn as sns
+```
+
+2. Set dataframe
+
+```python3
+df = sns.load_dataset("titanic")
+df
+```
+
+3. Boxplot
+
+```python3
+sns.boxplot(x="sex", y="age", data=df, hue="survived")
+```
+
+4. Catplot
+
+```python3
+sns.catplot(x="sex", hue="survived", data=df, kind="count")
+```
+
+---
+