Added coding standards

.editorconfig

@@ -1,8 +1,9 @@
 # https://editorconfig.org
 root = true
 
-[*.php]
+[*]
 charset = utf-8
+end_of_line = lf
 indent_size = 4
 indent_style = space
 insert_final_newline = true

.gitattributes

@@ -1,17 +1,5 @@
 * text=auto
 
-.* text
-*.http text
-*.info text
-*.json text
-*.md text
-*.neon text
-*.php text diff=php
-*.txt text
-*.xml text
-*.yml text
-*.yaml text
-
 *.ico binary
 *.jpg binary
 *.pdf binary

.phpcs.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<ruleset name="SLPSR12" namespace="Sitelease\OpenCore">
+    <description>Sitelease's augmented PSR-12 standard</description>
+    <rule ref="PSR12">
+        <exclude name="PSR12.Files.FileHeader" />
+        <exclude name="Squiz.WhiteSpace.OperatorSpacing" />
+        <exclude name="PSR12.Operators.OperatorSpacing" />
+        <exclude name="PSR2.ControlStructures.ControlStructureSpacing.SpacingAfterOpenBrace"/>
+    </rule>
+</ruleset>