Add PSR-20 pages

Author: Jean85

source/_psr/psr-20-clock-meta.twig

@@ -0,0 +1,11 @@
+---
+psr_number: psr-20
+permalink: /psr/psr-20/meta
+title: 'PSR-20 Meta Document'
+markdown_source: fig-standards/accepted/PSR-20-clock-meta.md
+related:
+    - { name: 'PSR-20: Clock', permalink: /psr/psr-20/ }
+    - { name: 'PSR-20 Meta Document' }
+---
+
+{{ parent() }}

source/_psr/psr-20-clock.twig

@@ -0,0 +1,11 @@
+---
+psr_number: psr-20
+permalink: /psr/psr-20/
+title: 'PSR-20: Clock'
+markdown_source: fig-standards/accepted/PSR-20-clock.md
+related:
+    - { name: 'PSR-20: Clock' }
+    - { name: 'PSR-20 Meta Document', permalink: /psr/psr-20/meta }
+---
+
+{{ parent() }}