Create X501AA.PLI

Added PL/I code_samples instructions
Added PL/I code samples

Co-authored-by: edemcenko <[email protected]>
Co-authored-by: VAranouski <[email protected]>
Co-authored-by: Uladzislau <[email protected]>
Signed-off-by: Uladzislau <[email protected]>

Author: 3 people

code_samples/ADVNTOPT.md

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+1. PL/I language version the source code is applicable to:
+    - IBM PL/I for z/OS V6.1
+2. Compiler used to build the source code / supported by compilers:
+    - IBM® Enterprise PL/I for z/OS  6.1      (Built:20230320)
+3. Operating system, where the code is possible to run + the version of the OS:
+    - IBM z/OS v 2.5
+4. Brief inputs and outputs of the program:
+    - Input is a DATA FILE CONTAINS SEVERAL SECTIONS. See the source file for details
+5. Expected instructions to be highlighted / supported by LSP:
+    - see [ADVNTOPT.png](ADVNTOPT.png)

code_samples/ADVNTOPT.pli

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+1. PL/I language version the source code is applicable to:
+    - IBM PL/I for z/OS V6.1
+2. Compiler used to build the source code / supported by compilers:
+    - IBM® Enterprise PL/I for z/OS  6.1      (Built:20230320)
+3. Operating system, where the code is possible to run + the version of the OS:
+    - IBM z/OS v 2.5
+4. Brief inputs and outputs of the program:
+    - INPUT        SYSUT1 - COMPILER LISTING
+    - OUTPUT       SYSPRINT - STRUCTURE CHART
+    - OUTPUT       SYSUT2   - COMPILER LISTING (FOR PRINT OPTION)
+5. Expected instructions to be highlighted / supported by LSP:
+    - see [CHART.png](CHART.png)