Add introduction to booleans concept (#155)

concepts/booleans/.meta/config.json

@@ -1,7 +1,7 @@
 {
-    "blurb": "TODO: add blurb for this concept",
+    "blurb": "Pyret provides a Boolean primitive with two distinct values: 'true' and 'false'.",
     "authors": [
-        "YourNameHere"
+        "BNAndras"
     ],
     "contributors": []
 }

concepts/booleans/about.md

@@ -1 +1,36 @@
-# TODO:  Add about for this concept
+# Introduction
+
+Pyret has two distinct Boolean primitives, `true` and `false`.
+These two values represent whether a statement or condition is valid or not.
+
+```pyret
+"a" == "a" # true
+"a" == "b" # false
+```
+
+Pyret provides the operators `and` and `or` that can combine Boolean values.
+
+The and operator returns true if both sides are true and false for all other combinations.
+
+```pyret
+true and true # true
+true and false # true
+false and true # false
+false and false # false
+```
+
+The or operator returns true if at least one side is true and false if both sides are false.
+
+```pyret
+true or true # true
+true or false # true
+false or true # true
+false or false # false
+```
+
+`not()` is a built-in function that flips a true to false or a false to true.
+
+```pyret
+not(true) # false
+not(false) # true
+```

concepts/booleans/introduction.md

@@ -1 +1,36 @@
-# TODO: Add introduction for this concept
+# Introduction
+
+Pyret has two distinct Boolean primitives, `true` and `false`.
+These two values represent whether a statement or condition is valid or not.
+
+```pyret
+"a" == "a" # true
+"a" == "b" # false
+```
+
+Pyret provides the operators `and` and `or` that can combine Boolean values.
+
+The and operator returns true if both sides are true and false for all other combinations.
+
+```pyret
+true and true # true
+true and false # true
+false and true # false
+false and false # false
+```
+
+The or operator returns true if at least one side is true and false if both sides are false.
+
+```pyret
+true or true # true
+true or false # true
+false or true # true
+false or false # false
+```
+
+`not()` is a built-in function that flips a true to false or a false to true.
+
+```pyret
+not(true) # false
+not(false) # true
+```

concepts/booleans/links.json

@@ -1,6 +1,6 @@
 [
     {
-        "url": "http://example.com/",
-        "description": "TODO:  add new link (above) and write a short description here of the resource."
+        "url": "https://pyret.org/docs/latest/A_Tour_of_Pyret.html#%28part._.Booleans%29",
+        "description": "A Tour of Pyret: Booleans"
     }
 ]