add intents docs and samples

samples/intent-sample.lua

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+function on_resume()
+    ui:show_lines{
+        "open browser",
+        "open market",
+        "open google feed",
+        "open player",
+        "send broadcast to launcher (open apps menu)",
+    }
+end
+
+function on_click(idx)
+    if idx == 1 then
+        intent:start_activity{
+            action = "android.intent.action.VIEW",
+            data = "https://aiolauncher.app",
+        }
+    elseif idx == 2 then
+        intent:start_activity{
+            action = "android.intent.action.MAIN",
+            category = "android.intent.category.APP_MARKET",
+        }
+    elseif idx == 3 then
+        intent:start_activity{
+            action = "com.google.android.googlequicksearchbox.GOOGLE_SEARCH",
+            extras = {
+                query = "AIO Launcher",
+            },
+        }
+    elseif idx == 4 then
+        intent:start_activity{
+            action = "android.intent.action.VIEW",
+            category = "android.intent.category.DEFAULT",
+            data = "file:///system/product/media/audio/ringtones/Atria.ogg",
+            type = "audio/ogg",
+    }
+    else
+        intent:send_broadcast{
+            action = "ru.execbit.aiolauncher.COMMAND",
+            extras = {
+                cmd = "apps_menu",
+            },
+        }
+    end
+end

samples/msg-receiver.lua

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+function on_resume()
+    ui:show_text("empty")
+end
+
+function on_message(value)
+    if type(value) == "table" then
+        ui:show_text("table first element: "..value[1])
+    else
+        ui:show_text(value)
+    end
+end

samples/msg-sender.lua

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+function on_resume()
+    ui:show_lines{
+        "send text",
+        "send 123",
+        "send table",
+    }
+end
+
+function on_click(idx)
+    if idx == 1 then
+        system:send_message("text", "msg-receiver.lua")
+    elseif idx == 2 then
+        system:send_message(1)
+    else
+        system:send_message{ "one", "two", "three" }
+    end
+end

samples/shttp-text.lua

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+-- name = "Chuck Norris jokes (experimental)"
+-- description = "icndb.com"
+-- data_source = "icndb.com"
+-- type = "widget"
+-- author = "Evgeny Zobnin (zobnin@gmail.com)"
+-- version = "1.0"
+
+function on_alarm()
+    local response = shttp:get("http://api.icndb.com/jokes/random")
+
+    if response.error ~= nil then
+        ui:show_text(response.error)
+        return
+    end
+
+    if response.code >= 200 and response.code < 300 then
+        joke = ajson:get_value(response.body, "object object:value string:joke")
+        ui:show_text(joke)
+    end
+end
+
+function on_click()
+    if joke ~= nil then
+        system:copy_to_clipboard(joke)
+    end
+end