feat(challenges): add print-pyramid

challenges/print-pyramid/README.md

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+# print-pyramid
+
+Created by [@Divlo](https://github.com/Divlo) on 21 September 2021.
+
+## Instructions
+
+Display a pyramid of stars (`*`) whose height is given and in the right order (`normal` or `reverse`).
+
+### Input
+
+- **Line 1:** The string : `normal` or `reverse` to determine how to show the pyramid.
+- **Line 2:** The integer : height of the pyramid.
+
+## Examples
+
+See the `test` folder for examples of input/output.
+
+### Example 1
+
+#### Input
+
+```txt
+normal
+3
+```
+
+#### Output
+
+```txt
+  *
+ ***
+*****
+```
+
+### Example 2
+
+#### Input
+
+```txt
+reverse
+3
+```
+
+#### Output
+
+```txt
+*****
+ ***
+  *
+```

challenges/print-pyramid/test/1/input.txt

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+normal
+3

challenges/print-pyramid/test/1/output.txt

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+  *  
+ *** 
+*****

challenges/print-pyramid/test/2/input.txt

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+reverse
+3

challenges/print-pyramid/test/2/output.txt

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+*****
+ *** 
+  *  

challenges/print-pyramid/test/3/input.txt

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+normal
+8

challenges/print-pyramid/test/3/output.txt

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+       *       
+      ***      
+     *****     
+    *******    
+   *********   
+  ***********  
+ ************* 
+***************

challenges/print-pyramid/test/4/input.txt

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+reverse
+8

challenges/print-pyramid/test/4/output.txt

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+***************
+ ************* 
+  ***********  
+   *********   
+    *******    
+     *****     
+      ***      
+       *       

challenges/print-pyramid/test/5/input.txt

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+normal
+9

challenges/print-pyramid/test/5/output.txt

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+        *        
+       ***       
+      *****      
+     *******     
+    *********    
+   ***********   
+  *************  
+ *************** 
+*****************

challenges/print-pyramid/test/6/input.txt

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+reverse
+9

challenges/print-pyramid/test/6/output.txt

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+*****************
+ *************** 
+  *************  
+   ***********   
+    *********    
+     *******     
+      *****      
+       ***       
+        *