added focus points and observable samples to readme

Author: code-inflation

README.md

@@ -1,12 +1,38 @@
 # pcp-reactive
-school proj about reactive programming in JS/ TS
+School proj about reactive programming in JS/ TS
 
-## TODO
-### Reactive (Java- / TypeScript)
+## Reactive (Java- / TypeScript)
 - Basics idea: asynchronous data streams
 - Observers
 - Hot vs. cold observables
-- Frameworks: ReactJS, Reactor, ... ?
+    - COLD is when your observable creates the producer
+    ```js
+        // COLD
+        var cold = new Observable((observer) => {
+        var producer = new Producer();
+        // have observer listen to producer here
+        });
+    ```
+    - HOT is when your observable closes over the producer
+    ```js
+        // HOT
+        var producer = new Producer();
+        var hot = new Observable((observer) => {
+        // have observer listen to producer here
+        });
+    ```
+- Subjects
+	- Behavior Subject
+	- Replay Subject
+- Operators
+	- Map
+	- SwitchMap
+	- MergeMap
+	- Filter
+	- Scan
+- Frameworks:
+	- RxJS
+	- RxJava
 
 ## Notes
 - https://medium.com/@benlesh/hot-vs-cold-observables-f8094ed53339