add pointers concept (#741)

* Create .meta

* Create links.json

* Delete .meta

* Create config.json

* Create about.md

Rough first draft. TODO: cover use of pointers for function parameters.

* Create introduction.md

Just a stub for now

* Update about.md

* Update about.md

* Update about.md

* Update about.md

Added pointers with functions

* Update about.md

Added caveat for char *.

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update about.md

Tweaks for backticking types more consistently, regularizing the term for indirection operator, and some other minor fixes. There is a bit more left to do...

* Update about.md

Tweaked the comments in the code example for Arrays and Pointers.

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update concepts/pointers/about.md

Co-authored-by: wolf99 <[email protected]>

* Update about.md

A couple of recent suggested changes.

* Update introduction.md

First draft of Introduction.md. Based on About.md

Co-authored-by: wolf99 <[email protected]>

concepts/pointers/.meta/config.json

@@ -0,0 +1,7 @@
+{
+  "blurb": "Pointers are variables or constants whose value is the memory address of another variable or constant.",
+  "authors": [
+    "bobahop"
+  ],
+  "contributors": []
+}