Added Readme

README.MD

@@ -0,0 +1,58 @@
+# Purpose
+This repostiory contains examples which might be used to show/explain why and when deadlocks happen in MSSQL.
+
+# How to
+1. Open two different SQL sessions.
+2. In each session open one file.
+3. Run SQL commands according to comments.
+
+For example - running Read Commited should look like:
+
+### Session 1
+```sql
+SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
+
+BEGIN TRANSACTION
+    UPDATE Wycieczki
+        SET cena = cena*2
+    WHERE
+        kraj = 'Bangkok'
+-- STEP 1 RUN ABOVE
+```
+
+
+### Session 2
+```sql
+SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
+
+BEGIN TRANSACTION
+    UPDATE Bilety
+        SET cena = cena * 2
+    WHERE
+        kraj = 'Ateny'
+-- STEP 2 - RUN ABOVE
+```
+
+### Session 1
+```sql
+    SELECT
+        *
+    FROM
+        Bilety
+    WHERE
+        kraj = 'Ateny'
+-- STEP 3 RUN BETWEEN 1 AND 3
+COMMIT TRANSACTION -- COMMIT AFTER DEADLOCK HAPPENS
+```
+
+### Session 2
+```sql
+    SELECT
+        *
+    FROM
+        Wycieczki 
+    WHERE
+        kraj = 'Bangkok'
+-- STEP 4 RUN BETWEEN 2 AND 4
+COMMIT TRANSACTION -- COMMIT AFTER DEADLOCK HAPPENS
+```