Linear Equation Solving Concept (#1061)

* Linear Equation Solving Concept

* edits suggested by reviewer

---------

Co-authored-by: Colin Leach <colin.ex@pm.me>

Author: colinleach

concepts/linear-equation-solving/.meta/config.json

@@ -0,0 +1,7 @@
+{
+  "authors": [
+    "colinleach"
+  ],
+  "contributors": [],
+  "blurb": "Systems of linear equations are generally solved by Linear Algebra techniques, all fully supported in Julia."
+}