fix: devcontainers and docs

Author: praisetompane

.devcontainer/devcontainer.json

@@ -0,0 +1,6 @@
+{
+    "name": "sql",
+    "image": "postgres:latest",
+    "workspaceMount": "source=${localWorkspaceFolder},target=/sql,type=bind,consistency=delegated",
+    "workspaceFolder": "/sql"
+}

.github/workflows/sql.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-lates
+    runs-on: ubuntu-latest
     steps:
       - name: "Check Repository"
         uses: actions/checkout@v4

.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+.vscode
+
+ecosystem/
+scratch_pad/
+journal/
+applications/

.spellcheck_exceptions_dictionary.txt

@@ -0,0 +1,62 @@
+# authors
+praisetompane
+
+# institutions
+iec
+
+# acronyms
+JRT
+MYINC
+PSM
+svg
+yaml
+CTEs
+TVFs
+UDFs
+RDBMS
+TSQL
+
+# domain specific
+Equi
+Thetha
+subqueries
+subquery
+
+# sql keywords
+Schemabinding
+NTILE
+CONCAT
+IIF
+NVARCHAR
+VARCHAR
+sys
+UNPIVOT
+DESC
+
+# technology
+pyspelling
+
+# test data
+N'davis
+N'string
+NumberOfOrders
+OrderDate
+OrderYear
+TotalFreight
+ustid
+empID
+empid
+firstname
+helpcollations
+lastname
+orderDate
+orderID
+orderby
+orderid
+custid
+mutlivalued
+
+# urls
+https
+roadmap
+txt

0_implementations/0_def.txt

@@ -0,0 +1,12 @@
+Known implementations:
+    - TSQL
+    - PL/SQL
+    - mySQL
+    - PostgreSQL
+    - ...
+    
+    NB: Some of these are also the names of the Relational Database Management System(RDBMS)
+    see: https://github.com/praisetompane/mathematics/blob/main/03_mathematical_logic_and_foundations/5_relation.txt
+
+References:
+   

0_implementations/1_lexical_and_syntactical_BNF_notation.txt

@@ -0,0 +1,4 @@
+Normalization
+
+	Informally, 2NF and 3NF are commonly summarized with the sentence, Every non-key attribute is
+	dependent on the key, the whole key, and nothing but the key�so help me Codd