Add programming docs (#487)

Author: iHiD

programming/README.md

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+# Programming
+
+Docs on programming topics

programming/config.json

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+[
+  {
+    "uuid": "1a737701-e2f7-4021-9057-a0faf4738740",
+    "slug": "APEX",
+    "path": "programming/README.md",
+    "title": "Programming docs",
+    "blurb": "Docs on programming topics"
+  },
+  {
+    "uuid": "54390764-ef34-4385-b714-ab2851bdd814",
+    "slug": "reaminder",
+    "path": "programming/operators/README.md",
+    "title": "Operators",
+    "blurb": "Docs on operators"
+  },
+  {
+    "uuid": "f1848a5a-593d-411f-9d44-4d4849690e1e",
+    "slug": "remainder",
+    "path": "programming/operators/remainder.md",
+    "title": "Remainder",
+    "blurb": "The remainder operators"
+  },
+]

programming/operators/README.md

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+# Operators
+
+Docs on operators

programming/operators/remainder.md

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+# Remainder
+
+In mathematics, the **remainder** is the amount "left over" after performing some computation.
+For example, the remainder of `5 / 3` is `2`.
+
+Many programming languages use the percentage sign (`%`) as an operator to calculate the remainder.
+For example, this is valid code in Javascript and Python:
+```javascript
+5 % 3 == 2
+```
+
+Remainders can often be calculated on both integers and floating point numbers.
+For example,
+```javascript
+5.3 % 3 == 2.3
+```
+
+When working with negative numbers, the result always has the same sign as the dividend (the number on the left hand side that is being divided).
+For example:
+```javascript
+-5 % 3 == -2
+5 % -3 == 2
+-5 % -3 == -2
+```
+
+Some languages use the `%` operator for the calculating the modulus, not the remainder.
+This treats negative numbers differently.
+You can learn more about this [on Wikipedia](https://en.wikipedia.org/wiki/Modulo).
+
+