adding readme

Readme.md

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+# Introduction
+
+# Basic
+
+## Digital outputs
+
+```c
+#include <Arduino.h>
+// vars and pins
+const int led = 9;
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(led, OUTPUT);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  digitalWrite(led, LOW);
+  delay(500);
+  digitalWrite(led, HIGH);
+  delay(500);
+}
+```
+
+## PWM outputs
+
+```c
+#include <Arduino.h>
+// vars and pins
+const int led = 9;
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(led, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  Serial.print("pwm on\n");
+  for(int pwm=0; pwm<=255; pwm+=5){
+    analogWrite(led, pwm);
+    delay(50);
+  }
+Serial.print("pwm off\n");
+for(int pwm=255; pwm>=0; pwm-=5){
+    analogWrite(led, pwm);
+    delay(50);
+  }
+}
+```
+
+## Analog readings
+
+```c
+#include <Arduino.h>
+// vars and pins
+const int led = 9;
+const int T2 = A2;
+int T2Val;
+
+void setup() {
+  // put your setup code here, to run once:
+  //pinMode(led, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  T2Val = analogRead(T2);
+  Serial.print("ADC: ");
+  Serial.println(T2Val);
+  delay(100);
+}
+```